JavaScript对象-自定义对象、Math对象、Array对象、Date对象、String对象
一：javascript对象
<body>
<p>
自定义对象
</p>
<script>
document.writeln("第一种方式<br/>");
people=new Object();
people.name="ymt";
people.age=26;
document.write("name:"+people.name+"<br/>age:"+people.age);
document.writeln("<br/>第二种方式<br/>");
people={name:"ymt",age:26};
document.write("name:"+people.name+"<br/>age:"+people.age);
</script>
<p>
使用函数自定义对象
</p>
<script>
function people(name,age){
this.name=name;
this.age=age;
}
son=new people("ymt",26);
document.write("name:"+son.name+"<br/>age:"+son.age);
</script>
</body>
二：String对象
<body>
<p>
<h1>注意下面两种中test的不同</h1>
</p>
<p>
第一种方式
</p>
<script>
var del,vel;
del="这是直接使用字符串显示创建";
vel="这是直接使用字符串显示创建";
del.test="12";
document.write("del.test:"+del.test+"<br/>vel.test:"+vel.test);
</script>
<p>
第二种方式
</p>
<script>
var gamma, delta;
gamma = new String("这是一个字符串");
delta = new String("这是也一个字符串");
gamma.test = 10;
document.write("gamma.test:"+gamma.test+"<br/>delta.test:"+delta.test);
</script>
<p>
<h1>constructor属性</h1>
</p>
<script>
hi=new String("hi");
if(hi.constructor==String){
document.write("这是一个String类型<br/>");
}
function MyFunc(){
}
var y=new MyFunc;
if(y.constructor==MyFunc){
document.write("这是一个MyFunc")
}
</script>
<p>
<h1>prototype属性</h1>
</p>
<script>
function array_max(){
var i,max=this[0];
for(i=0;i<this.length;i++){
if(max<this[i]){
max=this[i];
}
}
return max;
}
Array.prototype.max=array_max;
x=new Array(1,2,3,4,5,6);
var y= x.max();
document.write("the max of x is:"+y);
</script>
</body>
三：Date对象
<body onload="getTime()">
<script>
function getTime(){
var date=new Date();
var riqi="today is :";
riqi=date.getFullYear()+"-";
riqi+= date.getMonth()+1+"-";
riqi+= date.getDay();
var h=date.getHours();
var m=date.getMinutes();
m=checkTime(m);
var s=date.getSeconds();
s=checkTime(s);
document.getElementById("time").innerHTML=riqi+" "+h+":"+m+":"+s;
setTimeout(function(){
getTime();
},1000);
}
function checkTime(i){
if(i<10){
i="0"+i;
}
return i;
}
</script>
<div id="time"></div>
<script>
d = new Date(Date.UTC(1996, 4, 8, 16, 30));
document.write(d);
</script>
</body>
四：Array对象
<body>
<p>
<h1>介绍数组对象</h1>
</p>
<script>
a=new Array("5","3","2","1","4");
document.write(a+"<br/>");
document.write(a.sort(function(a,b){
return a-b;
})+"<br/>");
document.write(a.sort(function(a,b){
return b-a;
}));
</script>
<p>
<h1>数组的常用的方法</h1>
</p>
<ui>
<li>Array.<big>concat</big></li>
<li>Array.<big>reserve</big></li>
<li>Array.<big>shift</big></li>
<li>Array.<big>push</big></li>
<li>Array.<big>jion</big></li>
</ui>
</body>
五：Math对象
<body>
<p>
Math的一些常用的方法
</p>
<script>
document.write("Math.abs(-10):");
document.write(Math.abs(-10));
document.write("<br/>");
document.write("parseInt(Math.random()*10):");
document.write(parseInt(Math.random()*10));
document.write("<br/>");
document.write("Math.round(20.4):");
document.write(Math.round(20.4));
document.write("<br/>");
</script>
</body>
