JavaScript break跳出多重循环

 

 

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