JS(二)

对象里面的属性和方法比较多啊,不容易记住,需要多实践:

1.将一串字符串的顺序颠倒,并实现首尾字母大写的两种方法:

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>关于字符串翻转的理解</title>
</head>
<body>
<script type="text/javascript">
/*var str = window.prompt("请输入你的字符串,么么哒!");
var length = str.length;
var m,n;
for(var i = length-1; i>=0; i--){
    if(i==length-1 || i==0){
        m = str.charAt(i);
        m = m.toUpperCase();
        document.write(m);
    }else{
        document.write(str.charAt(i));     //直接对字符串进行操作
    }
}*/

var str = window.prompt("Darling,please input your string!");
var arr = str.split("");
var length = arr.length;
arr[0] = arr[0].toUpperCase();
arr[length-1] = arr[length-1].toUpperCase();
arr = arr.reverse();
str = arr.join("");
document.write(str);                      //将字符串转换成数组进行操作,在转成字符串
</script>
</body>
</html>

2.获取邮箱用户名和域名的函数:

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>获取邮箱的域名函数</title>
</head>
<body>
<script type="text/javascript">
var str = window.prompt("Buddy,please input your email!");
function getEmail(email){
    var a = email.indexOf("@");
    var username = email.substring(0,a);
    var address = email.substr(a+1);
    return(document.write("用户名:"+username+";<br>域名:"+address+"."));
}
getEmail(str);
</script>    
</body>
</html>

 

posted @ 2016-12-06 23:17  panbee  阅读(173)  评论(1)  编辑  收藏  举报