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第二章 JavaScript案例（中）

1. js事件


HTML代码

<!DOCTYPE html>
<html lang="en" onUnload="ud()">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <script>
        function demo() {
            alert("hello");
        }

        function onOver(ooj) {
            ooj.innerHTML = "鼠标移入显示";
        }

        function onOut(ooj) {
            ooj.innerHTML = "鼠标移出显示";
        }

        function changeDemo(bg) {
            alert("内容改变了啊")
        }

        function changeDemo1(bg) {
            bg.style.background = "red";
        }

        function changeDemo2(bg) {
            bg.style.background = "blue";
        }

        function mgs() {
            alert("内容加载完毕")
        }

        function bu(bg) {
            var b = bg.value;
            alert("鼠标移开事件(您输入的是)" + b);
        }

        function ud() {
            alert("您关闭了网页")

        }

    </script>

    <style>
        .div {
            width: 100px;
            height: 100px;
            background-color: cadetblue;
        }

    </style>
</head>
<body onload="mgs()" onunload="ud()">
<!--网页加载完毕事件，网页关闭事件(关闭后执行看不见)-->
<button onclick="demo()">按钮</button>
<!--单机事件-->
<div class="div" onmouseout="onOut(this)" onmouseover="onOver(this)">开始显示</div>
<form>
    <input type="text" onchange="changeDemo(this)"/>
    <!--文本内容改变事件-->
    <input type="text" onselect="changeDemo1(this)" onfocus="changeDemo2(this)"/>
    <!--文本内容选中事件--> <!--鼠标聚集（选中）事件-->
    <input type="text" onblur="bu(this)"/>
    <!--移开光标事件事件-->

</form>
</body>
</html>

2. js异常


试一试不输入

HTML代码

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>异常处理</title>
    <script>
        function demo() {
            try {
                alert(str);//str为空
            }catch(err){
                alert(err);
            }
        }
        demo();
        function demo1(){
            var e = document.getElementById("txt").value;
            try{
                if(e==""){
                    throw "您没有输入文字";//自定义异常
                }
            }catch(err){
                alert(err);
            }

        }
    </script>
</head>
<body>
<form>
    <input type="text" id="txt">
    <input type="button" onclick="demo1()" value="按钮">
</form>
</body>
</html>

3. js条件语句


HTML代码

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>语句</title>
    <script>
        var i = 9;//修改i值
        if (i > 10) {
            document.write("我大于10"+"</br>");
        } else if (i < 10) {
            document.write("我小于10"+"</br>");
        } else {
            document.write("我等于十"+"</br>")
        }
    </script>
    <script>
        var i = 5;//修改i值
        switch (i) {
            case 1:
                document.write("i=1")
                break;
            case 2:
                document.write("i=2")
                break;
            default:
                document.write("i=" + i+"</br>");
                break;
        }
        //        跳转语句break(跳出循环——结束循环) continue（跳过当次循环） return(返回一个值，结束)
    </script>
    <script>
        for(var i=0;i<10;i++){
            if(i==5){
                break;
//                continue;
            }
            document.write("i="+i+"</br>");
        }
    </script>
    <script>
        var i = [1,2,3,4,5,6];
        var j;
        for(j in i){//如果j是i中的一个元素
            document.write(i[j]+"</br>");
        }
    </script>
    <script>
        var i = 1;
        while(i<10){
            document.write("i="+i+"</br>");
            i++;
        }
        document.write("</br></br></br></br>")
    </script>
    <script>
        var i = 10;
        do{//会执行一次do里面的语句在判断
            document.write(i+"</br>");
        }while(i<2){
            document.write("i="+i+"</br>");
            i++;
        }
    </script>
</head>
<body>

</body>
</html>

4. js句柄监听事件

效果是打印hello

HTML代码

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>句柄添加监听事件</title>
    <script type="text/javascript" src="tzy.js"></script>
</head>
<body>
<button id="mybtn" onclick="demo()">按钮</button>
<script>
     //注意这种引用样式必须放在button后面不然出现
     //Uncaught TypeError: Cannot read property 'addEventListener' of null
     //错误：页面未加载完成
     var x = document.getElementById("mybtn");
     x.addEventListener("click", hello);
     x.addEventListener("click", world);//添加
     x.removeEventListener("click", world);//移除
     function hello() {
     alert("hello");
     }

     function world() {
     alert("world");
     }
</script>
</body>
</html>

JS代码(tzy.js)
注释上面中间的JS代码，放入外文件，用外链接方式引用

//注意这种引用样式必须放在button后面不然出现
//Uncaught TypeError: Cannot read property 'addEventListener' of null
//错误：页面未加载完成
function demo(){
    var x = document.getElementById("mybtn");

    x.addEventListener("click", hello);
    x.addEventListener("click", world);//添加
    x.removeEventListener("click", world);//移除
}
function hello() {
    alert("hello");
}

function world() {
    alert("world");
}

5. jsDOM

HTML代码

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>JsDOM对象</title>
    <script type="text/javascript" src="tzy.js"></script>
</head>
<body>
<p name = "pn">hello</p>
<p name = "pn">hello</p>
<p name = "pn">hello</p>
<p name = "pn">hello</p>
<a id = "aid" title = "title属性"></a>
<ul><li id="li1">1</li><li>2 3</li><li>3</li></ul>
<div id="div">
    <p id="pid">我是p节点</p>
    <p id="pid1">我是p1节点</p>
</div>
<script>
    function getName() {
        var count = document.getElementsByName("pn");//根据name获取
        alert("count长度"+count.length);//看是否获取到
        var p = count[2];
        p.innerHTML = "world";
        var count1 = document.getElementsByTagName("p");//根据标签名获取
        alert("count1长度"+count1.length);
        var p1 = count1[3];
        p1.innerHTML = "hahaha";
    }
    getName();
    function getSetAttr() {
        var a = document.getElementById("aid");//根据id获取
        var attr = a.getAttribute("title");//获取当前元素某个属性值
        alert(attr);
        a.setAttribute("id","动态被设置为id")//设置当前元素某个属性值
        var attr1 =a.getAttribute("id");
        alert(attr1);
    }
    getSetAttr();
    function getChildNode(){
        var childnode = document.getElementsByTagName("ul")[0].childNodes;//获取子节点项，注意ul里面空格也会算子节点，所以要去掉空格
        alert("ul的字节点数"+childnode.length);
        alert("ul里的第一个子节点类型"+childnode[0].nodeType);//有疑问
        alert("ul里的第二个子节点类型"+childnode[1].nodeType);
    }
    getChildNode();
    function getParentNode() {
        var li1 = document.getElementById("li1");
        alert("li1的父节点"+li1.parentNode.nodeName);//获取父节点及名字
    }
    getParentNode();
    function createNode(){
        var body = document.body;//获取body
        var input = document.createElement("input");//创建节点
        input.type = "button";
        input.value = "自建按钮";
        body.appendChild(input);//将节点添加到body中
        //createTextNode()添加文本节点
    }
    createNode();
    function addNode() {
        var div = document.getElementById("div");
        var node = document.getElementById("pid");
        var newnode = document.createElement("p");
        newnode.innerHTML = "这是我添加的p节点";
        div.insertBefore(newnode,node);//添加节点到某个节点前
    }
    addNode();
    function removeNode() {
        var div = document.getElementById("div");
        var p = div.removeChild(div.childNodes[2]);//删除p节点因为空格算一个节点
    }
    removeNode();
    function getSize(){
        //offsetheight     网页尺寸（不包含滚动条）
        //scrollheight     网页尺寸（包含滚动条）
        var height = document.body.offsetHeight||document.documentElement.offsetHeight;//兼容性写法
        var width = document.body.offsetWidth;
        alert("宽度"+width+"高度"+height);
    }
    getSize();
</script>
</body>
</html>

6. js计时器与倒计时


HTML代码

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>倒计时</title>
</head>
<body onload="getwin()">
<p id="ptime">现在时间</p>
<p id="ptime1">距离2018年时间</p>
<button id="btn" onclick="stopTime()">停止时间按钮</button>
<button id="btn1" onclick="stopwin()">停止弹出框按钮</button>
<script>
    var mytime = setInterval(function(){getTime();},1000);//间隔一秒执行一次该方法
    function getTime() {
        var nowtime = new Date();//获取当前时间
        var time = nowtime.toLocaleTimeString();//转换日期十分秒
        var endTime=new Date("2018/1/1,0:00:00") //设定倒计时结束时间
        var timeXX=(endTime.getTime()-nowtime.getTime())/(1000);//距离2018年的秒数

        var date=parseInt(timeXX/(24*60*60)); //换算成天
        var xs=parseInt(timeXX/(60*60)%24); //得到小时
        var fz=parseInt(timeXX/60%60); //得到分钟
        var ms=parseInt(timeXX%60); //得到秒数

        var year=nowtime.getFullYear(); //获取现在的年
        var month=nowtime.getMonth()+1; //获取现在的月 必须+1
        var data=nowtime.getDate(); //获取现在的日
        var h=nowtime.getHours();//获取现在的小时
        var m=nowtime.getMinutes();//获取现在的分钟
        var s=nowtime.getSeconds();//获取现在的秒数
        h=checkTime(h);
        m=checkTime(m);
        s=checkTime(s);
        var d=nowtime.getDay(); //获取星期（因星期打印出事0~6，所以用数组形式转化成对应的星期）
        var weekday=['星期日','星期一','星期二','星期三','星期四','星期五','星期六'];
        document.getElementById("ptime").innerHTML=year+"年"+month+"月"+data+"日"+"&nbsp;"+weekday[d]+"&nbsp;"+h+":"+m+":"+s;
        //打印出当前年月日
        document.getElementById('ptime1').innerHTML='离2018年:'+date+'天'+xs+'小时'+fz+'分钟'+ms+'秒';
    }

    function getwin() {
        alert("我是3秒一个的弹出框");
        win = setTimeout(function(){getwin();},3000);//延迟3秒出现一个提示框
    }
    function stopTime() {
        clearInterval(mytime);
    }
    function stopwin() {
        clearTimeout(win);
    }
    function checkTime(i){
        //设置小于10的时间数字格式，例如5秒显示成05秒
        if(i<10){
            return '0'+i;
        }else{
            return i;
        }
    }
</script>

</body>
</html>

7. jsBOM


HTML代码

<!doctype html>
<html lang="en">
<head>
    <title>day02_js</title>
    <script type="text/javascript" language="javascript" src="tzy.js"></script>
    <meta charset="UTF-8">
</head>
<body>
<form>
    <h2>1.BOM演示针对window</h2>
    <input type="button" onclick="testConfirm()" value="confirm测试"/><br/><br/>
    <input type="button" onclick="testPromp()" value="promp测试"/><br/><br/>
    <input type="button" onclick="openTest()" value="open测试"/><br/><br/>
    <input type="button" onclick="closeTest()" value="close测试"/><br/><br/>
    <input type="button" onclick="refreshTest()" value="refresh测试"/><br/><br/>
    <input/><br/><br/>
    <input type="button" onclick="naviTest()" value="控制台查看信息测试"/><br/><br/>
    <input type="button" onclick="TimeTest()" value="计时开始"/>
    <input type="button" onclick="clearTime()" value="计时结束"/>
    <input id="i1"/><br/><br/>
</form>
</body>
</html>

JS代码(tzy.js)

function testConfirm(){
    var f = window.confirm("你确定此操作吗？");  //确定加取消的弹出框   参数自定义,返回值为点击确定=true,点击取消=false;
    alert(f);  //打印返回的boolean值
}
function testPromp(){
    var f = window.prompt("请输入用户名","周杰伦");     //提示语加text加确定加取消弹出框    第一个参数提示语，第二个参数默认值
    alert(f);  //打印输入框中的值 点即取消则返回null
}
function openTest(){
    //window.open("http://www.baidu.com");//打开一个新页面
    var config = "toolbar=yes,width=500,height=300";  //toolbar显示工具栏
    window.open("http://www.baidu.com","1",config)  //  参数1为自定义，否则不能按照config的大小打开新的窗口
}
function closeTest(){
    window.close();     //关闭当前页面
}
function refreshTest(){
    window.location.reload();  //页面刷新
}
function naviTest(){
    var arr = new Array(5);
    console.dir(arr);  //console.dir()可以在控制台显示一个对象所有的属性和方法。
    //console.log(window.navigator.appVersion);  //会在浏览器控制台打印出信息。   查看当前浏览的版本
    //console.dir(window.navigator.appVersion);
}
var timer;             //window定时器
function TimeTest(){
    timer = window.setInterval('func()',100);
}
var count = 0;
function func(){
    count++;
    document.getElementById("i1").value= count;
}
function clearTime(){
    window.clearInterval(timer);
}

补充：DOM操作

案例一


HTML代码

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <link rel="stylesheet" href="tzy.css" type="text/css">
    <script type="text/javascript" src="tzy.js" language="JavaScript"></script>
</head>
<body>
<div id="div"><b id="b">我是一只小小鸟</b></div>
<form>
    <input type="button" value="随机改变字体颜色按钮" onclick="gbzt()">
    <input type="button" value="随机改变背景颜色按钮" onclick="gbbj()"></br>
    <input type="text" id="text">
    内容<input type="button" value="改变内容" onclick="gbtext()"></br>
    宽度<input type="text" id="gbwid">px
    <input type="button" value="改变背景宽度" onclick="gbwidth()"></br>
    高度<input type="text" id="gbhei">px
    <input type="button" value="改变背景高度" onclick="gbheight()"></br>
    <input type="reset" value="清空输入框"></br>
    <input type="button" value="字体隐藏" onclick="ycb()">
    <input type="button" value="全部隐藏" onclick="ycdiv()"></br>
    <input type="button" value="字体显示" onclick="xsb()">
    <input type="button" value="全部显示" onclick="xsdiv()"></br>
    <input type="button" value="是否重置" onclick="firm()">
</form>
</body>
</html>

JS代码(tzy.js)

var chars = ['0','1','2','3','4','5','6','7','8','9','A','B','C','D','E','F'];
var color;
function randomColor() {
    color="";
    for(var i=0;i<6;i++){
        var count = Math.floor(Math.random()*16);
        color += chars[count];
    }
}
function gbzt() {
    randomColor();
    document.getElementById("div").style.color="#"+color;
}
function gbbj() {
    randomColor();
    document.getElementById("div").style.backgroundColor="#"+color;
}
function gbwidth() {
    var val = document.getElementById("gbwid").value;
    if(isNaN(val)||val==""){
        alert("必须输入数字,不能为空")
    }else{
        document.getElementById("div").style.width=val+'px';
    }
}
function gbheight() {
    var val = document.getElementById("gbhei").value;
    if(isNaN(val)||val==""){
        alert("必须输入数字,不能为空")
    }else{
        document.getElementById("div").style.height=val+'px';
    }
}
function gbtext() {
    var val = document.getElementById("text").value;
    document.getElementById("b").innerText = val;
}
function ycb() {
    document.getElementById("b").style.display = "none";
}
function ycdiv() {
    document.getElementById("div").style.display = "none";
}
function xsb() {
    document.getElementById("b").style.display = "block";
}
function xsdiv() {
    document.getElementById("div").style.display = "block";
    document.getElementById("b").style.display = "block"
}
function firm(){
    var yesorno = window.confirm("您确定取消所有设置么?")
    if(yesorno==true){
        window.location.replace("tzy1.html");
    }else{
        alert("没事瞎点什么！！！")
    }
}

css代码(tzy.css)

div{
    color: forestgreen;
    background-color: coral;
    width: 100px;
    height: 100px;

}

案例二


HTML代码

<!doctype html>
<html lang="en">
<head>
    <title>day03</title>
    <meta charset="UTF-8">
    <script type="text/javascript" language="javascript" src="tzy.js"></script>
    <style>
        table{
            border-collapse:collapse;
        }
        td{
            border:1px solid gray;
        }
        tr input{
            width:25px;
        }
    </style>
</head>
<body onload="testNode()">
<form>
    <h2>表单的验证与提交</h2>
    管理员账号：<input id="account" class="txt" onfocus="this.className='txt_focus';" onblur="valiAcc(this)"/>
    <span id="accountInfo">10个长度以内的字母、数字的组合</span><br/>
    电话号码：<input id="phone" class="txt" onfocus="this.className='txt_focus';" onblur="valiPhone(this)"/>
    <span id="phoneInfo">形如：010-12345678</span><br/><br/>
    <input type="submit" value="保存" onclick="alert(valiAll())" />
    <h2>节点查询展示</h2>
    <div id="div01">
        <p id="p01">我是段落1</p>
        <p id="p02">我是段落2</p>
        <input type="radio" name="sex"/>男
        <input type="radio" name="sex"/>女
    </div>
    <input type="radio" name="sex"/>无
    <h2>购物车</h2>
    <table id="shoppingCar">
        <tr>
            <td style="width:100px;">商品名称</td>
            <td style="width:100px;">单价</td>
            <td style="width:200px;">数量</td>
            <td style="width:100px;">小计</td>
        </tr>
        <tr>
            <td style="width:100px;">book1</td>
            <td style="width:100px;">10.0</td>
            <td style="width:200px;">
                <input type="button" value="-" onclick="decrease(this)"/>
                <input type="text" value="1" readonly="readonly"/>
                <input type="button" value="+" onclick="increase(this)"/>
            </td>
            <td style="width:100px;">10.0</td>
        </tr>
        <tr>
            <td style="width:100px;">book2</td>
            <td style="width:100px;">5.0</td>
            <td style="width:200px;">
                <input type="button" value="-" onclick="decrease(this)"/>
                <input type="text" value="1" readonly="readonly"/>
                <input type="button" value="+" onclick="increase(this)"/>
            </td>
            <td style="width:100px;">5.0</td>
        </tr>
        <tr>
            <td style="width:100px;">book3</td>
            <td style="width:100px;">15.0</td>
            <td style="width:200px;">
                <input type="button" value="-" onclick="decrease(this)"/>
                <input type="text" value="1" readonly="readonly"/>
                <input type="button" value="+" onclick="increase(this)"/>
            </td>
            <td style="width:100px;">15.0</td>
        </tr>
        <tr>
            <td colspan="3" style="text-align:right" >总计:</td>
            <td>30.0</td>
        </tr>
    </table>
    <h2>节点增加展示</h2>
    <div id="div02">
        <p>我是第1个段落</p>
    </div>
    <input type="button" value="增加段落" onclick="addNode()"/>
    <input type="button" value="首行增加段落" onclick="addNode2()"/>
    <input type="button" value="删除段落" onclick="deleteNode()"/>
    <h2>动态创建页面元素</h2>
    <input type="button" onclick="productNode(this)" value="添加新元素"/>
</form>
</body>
</html>

JS代码(tzy.js)

function valiAcc(obj){
    obj.className= "txt";
    var account = obj.value;
    var regex = /^[0-9a-zA-Z]{1,10}$/g;
    var flag = regex.test(account);
    //判断
    if(flag){
        document.getElementById("accountInfo").className="vali_success";
        document.getElementById("accountInfo").innerText="";
    }else{
        document.getElementById("accountInfo").className="vali_fail";
        document.getElementById("accountInfo").innerText="10个长度以内的字母、数字组合";
    }
    return flag;
}
function valiPhone(obj){
    obj.className= "txt";
    var account = obj.value;
    var regex = /^\d{3}-\d{8}$/g;
    var flag = regex.test(account);
    //判断
    if(flag){
        document.getElementById("phoneInfo").className="vali_success";
        document.getElementById("phoneInfo").innerText="";
    }else{
        document.getElementById("phoneInfo").className="vali_fail";
        document.getElementById("phoneInfo").innerText="形如：010-12345678";
    }
    return flag;
}
function valiAll(){
    var acc = document.getElementById("account");
    var phone = document.getElementById("phone");
    return valiAcc(acc) && valiPhone(phone);
}
function testNode(){
    var divObj = document.getElementById("div01");
    var parentNode = divObj.parentNode;
    //console.log(parentNode.nodeName+","+parentNode.nodeType);

    var nodeArr = divObj.childNodes;
    for(var i = 0;i<nodeArr.length;i++){
        //console.log(nodeArr[i].nodeName+","+nodeArr[i].nodeType);
    }
    var p02 = document.getElementById("p02");
    var p01 = p02.previousSibling.previousSibling;
    //console.log(p01.nodeName+","+p01.nodeType);

    var sexArr = document.getElementsByName("sex");
    //console.log(sexArr.length);

    var inputArr = document.getElementsByTagName("input");

    var inputAr= divObj.getElementsByTagName("input");
    console.log(inputAr.length);

}
//购物车减
function decrease(obj){
    var txtObj = obj.nextSibling.nextSibling;  //nextSibling 获取下一个节点
    if(txtObj.value>0){
        txtObj.value--;
    }
    cal();
}
//购物车加
function increase(obj){
    var txtObj = obj.previousSibling.previousSibling;   //previousSibling 获取上一个节点
    txtObj.value++;
    cal();
}
function cal(){
    var tbObj = document.getElementById("shoppingCar"); //获取table对象
    var trArr = tbObj.getElementsByTagName("tr"); //获取所有的行对象
    //定一个计数器，用存储总价值
    var totalPrice = 0;
    for(var i=1;i<trArr.length-1;i++){
        //获取当前行对象
        var trObj = trArr[i];
        //获取单价
        var price = trObj.getElementsByTagName("td")[1].innerText;
        //获取数量
        var num = trObj.getElementsByTagName("input")[1].value;
        //当前商品的小计
        var xj = price*num;
        //给小计栏赋值
        var tdArr = trObj.getElementsByTagName("td");
        tdArr[tdArr.length-1].innerText = xj.toFixed(2);
        totalPrice += xj;
    }
    trArr[trArr.length-1].lastChild.previousSibling.innerText = totalPrice.toFixed(2);
}
var n = 1;
function addNode(){
    n++;
    var divObj = document.getElementById("div02");
    var pObj = document.createElement("p"); // <p></p>
    pObj.innerText="我是第"+n+"个段落";
    divObj.appendChild(pObj);
}

function addNode2(){
    var divObj = document.getElementById("div02");
    var pObj = document.createElement("p");
    pObj.innerText="我是第"+0+"个段落";
    divObj.insertBefore(pObj,divObj.getElementsByTagName("p")[0]);
}
function deleteNode(){
    if(n>0){
        n--;
    }
    var divObj = document.getElementById("div02");
    var pArr = divObj.getElementsByTagName("p");
    if(pArr.length>0){
        divObj.removeChild(pArr[pArr.length-1]);
    }
}

function productNode(obj){
    var newButton = document.createElement("input");  //<input></input>
    newButton.type="button";
    newButton.value="New Button";
    newButton.onclick=function(){
        alert("hello");
    }
    obj.parentNode.insertBefore(newButton,obj);

    var aObj=document.createElement("a");
    aObj.innerHTML="to百度";
    aObj.target="_blank";
    aObj.href="http://www.baidu.com";
    obj.parentNode.appendChild(aObj);
}

双色球案例


HTML代码

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>双色球生成器</title>
</head>
<body>
<div style="margin: 0 auto;padding: 0px;background-color: cadetblue;text-align: center;width:auto;height: auto">
    <h1>双色球生成器</h1>
    <form>
        <input type="button" value="机选按钮" onclick="random()"/>
    </form>
</div>
<script>
    function random() {
        var array = new Array(7);
        for(var i=0;i<array.length;i++){
            array[i] = Math.ceil(Math.random()*33);//向上转型
            if(i===6){
                array[i] = Math.ceil(Math.random()*16)
            }
        }
        for(var i=0;i<array.length-1;i++){
            for(var j=0;j<array.length-2;j++){
                if(array[j]>array[j+1]){
                    a = array[j];
                    array[j] = array[j+1];
                    array[j+1] = a;
                }
            }
        }
        alert("第1个红球："+array[0]+"\n"+"第2个红球："+array[1]+"\n"+"第3个红球："+array[2]+"\n"+
                "第4个红球："+array[3]+"\n"+"第5个红球："+array[4]+"\n"+"第6个红球："+array[5]+"\n"+"蓝球：| "+array[6]);
    }

</script>
</body>
</html>

轮播图案例

HTML代码

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>广告轮播</title>
    <script type="text/javascript" src="tzy.js" language="JavaScript"></script>
    <link rel="stylesheet" href="tzy.css" type="text/css">
</head>
<body onload="lunbozantin()">
<div>
    <p><b>我是轮播图片</b></p>
    <img style="width: 508px;height: 299px;" src="http://images2018.cnblogs.com/blog/1235870/201808/1235870-20180823110552195-398576301.png"  alt="lol图片" id="tupian"  onMouseOver="stoplunbo()" onMouseOut="lunbozantin()">
</div>
</body>
</html>

JS代码(tzy.js)

var arr = new Array("http://images2018.cnblogs.com/blog/1235870/201808/1235870-20180823110552195-398576301.png","http://images2018.cnblogs.com/blog/1235870/201808/1235870-20180823110608817-462634665.png","http://images2018.cnblogs.com/blog/1235870/201808/1235870-20180823110619409-2102515392.png","http://images2018.cnblogs.com/blog/1235870/201808/1235870-20180823110628900-1106270637.png");
var count = 1;
var b;
function lunbo() {
    a = document.getElementById("tupian");
    a.src =arr[count];
    count++;
    if(count==4){
        count=0;
    }
}
function stoplunbo(){
    clearInterval(b);
}function lunbozantin() {
    b = setInterval(lunbo,3000);
}

posted on 2018-08-23 11:42  咘雷扎克  阅读(328)  评论(0)  编辑  收藏  举报

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