2.17.JavaScript--JavaScript.函数arguments对象 

<!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>
posted @ 2012-03-15 22:30  校长阿四  阅读(191)  评论(0)    收藏  举报