多重循环在编程中会经常遇到,那么在JavaScript中如何指定跳出那层的循环呢。其实这也是break的一个用法,下面是一个不错的例子,来自《JavaScript权威指南》,可以参考下:

Code

<script type="text/javascript">
outerloop://命名外圈语句
for(i=0; i<10; i++)
{
	innerloop://命名内圈语句
	for(j=0; j<10; j++)
	{
		// 跳出内圈循环
		if(j>3){break;}
		// 跳出内圈循环
     	if(i==2){break innerloop;}
		// 跳出外圈循环
 		if(i==4){break outerloop;}
		document.write("i = "+i+" , j = "+j+"<br />");
	}
}
document.write("final"+" i = "+i+" , j = "+j);
</script>

  

程序运行结果:

i = 0 , j = 0
i = 0 , j = 1
i = 0 , j = 2
i = 0 , j = 3
i = 1 , j = 0
i = 1 , j = 1
i = 1 , j = 2
i = 1 , j = 3
i = 3 , j = 0
i = 3 , j = 1
i = 3 , j = 2
i = 3 , j = 3
final i = 4 , j = 0

  

退出each循环不能用break,否则会报错。退出each循环应该用return false,如:

var clientName = $("#clientName").val();
$.each(avaiableTags,function(key,value){
	if(value == clientName){return false;}
});