<!DOCTYPE HTML>
<html lang="en-US">
<head>
<meta charset="UTF-8">
<title>JavaScript.函数arguments对象</title>
</head>
<body>
<script type="text/javascript">
/*
function sayHello(){
//alert(arguments.length);
alert(arguments[0] + "-" + arguments[1] + "-" + arguments[2]);
};
sayHello("xiaozhanga4","apple","google");
*/
/*
function func(){
for(var i=0,arrs=[];i<arguments.length;i++){
arrs.push(arguments[i]);
}
alert(arrs.join(" - "));
}
func("facebook","baidu","renren");
*/
//模拟函数重载
function funcTest(){
switch(arguments.length){
case 0:
return alert("没有参数");
case 1:
return alert("1个参数:" + arguments[0]);
case 2:
return alert("2个参数:" + arguments[0] + "-" + arguments[1]);
case 3:
return alert("3个参数:" + arguments[0] + "-" + arguments[1] + "-" + arguments[2]);
}
}
funcTest();
funcTest(1);
funcTest(1,2);
funcTest(1,2,3);
</script>
</body>
</html>
<!DOCTYPE HTML>
<html lang="en-US">
<head>
<meta charset="UTF-8">
<title>arguments对象</title>
</head>
<body>
<ul>
<li id="apple">apple</li>
<li id="google">google</li>
<li id="facebook">facebook</li>
</ul>
<script type="text/javascript">
window['jquery'] = {};
window['jquery']['$'] = $;
function $(){
var elements = [];
for(var i=0;i<arguments.length;i++){//循环得到整个参数个数
element = arguments[i];//把数组赋给element
if(typeof element == "string"){//判断数组是否为字符串类型
element = document.getElementById(element);
}
if(arguments.length == 1){
return element;
}
elements.push(element);
}
return elements;
}
var items = jquery.$("apple","google","facebook");
for(var i=0;i<items.length;i++){
items[i].style.color = "red";
}
jquery.$("");
</script>
</body>
</html>
