流程控制语句

<title>流程控制语句</title>
<script type="text/javascript">
/*if(5>3)
alert("5打于3");
alert("哈哈");
alert("呵呵");*/

/*var a = 5;
switch(a){
case 0:alert(0);
case 1:alert(1);
default:alert("no");
case 2:alert(2);
case 3:alert(3);break;
case 4:alert(4);
}*/
//no
//0 1 no
//no 2 3 4


//for in
//作用一：循环数组
/*var arr = [1,2,3,4,5];
for(index in arr){
//alert("下标为："+a+"\n");
document.write("下标为："+index+"的元素值为："+arr[index]+"<br/>");
}*/
var a = 4;
var b = 5;

alert(window.window.window.window.window.window.window.window.a);

//作用二：遍历对象
/*for(attr in window){
document.write("属性："+attr+"的值为："+window[attr]+"<br/>");
}*/

</script>