javascript函数

<script type="text/javascript">
	var name = "The window";
	var object = {
		name : "My object",
		getNameFunc : function(){
			return function(){
				return this.name;
			};
		}
	};

	//alert(object.getNameFunc()());


	/*
	function outFun(){
		var a = 0;
		alert(a);
	}

	var a = 4;
	alert(a);	
	outFun();
	alert(a); //4 0 4 两个a没有半毛钱关系
	*/

	/*
	function outFun1(){
		b = 0;
		alert(b);
	}

	var b = 4;
	alert(b);	
	outFun1(); //全局变量覆盖了b
	alert(b);	
	// 4  0 0

	*/

	function selfUpdate(){
		window.selfUpdate = function (){
			alert("second run;");
		};

		alert("first run;");
	}

	selfUpdate(); //第一次运行时，用全局变量覆盖。
	selfUpdate();
	selfUpdate();


</script>