js跳出多重迴圈及$.each跳出多重迴圈
阿新 • • 發佈:2019-02-13
多重迴圈在程式設計中會經常遇到,那麼在JavaScript中如何指定跳出那層的迴圈呢。其實這也是break的一個用法,下面是一個不錯的例子,來自《JavaScript權威指南》,可以參考下:
Code
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<script
type= "text/javascript" >
outerloop: //命名外圈語句
for (i=0;
i<10; i++)
{
innerloop: //命名內圈語句
for (j=0;
j<10; j++)
{ //
跳出內圈迴圈
if (j>3){ break ;}
//
跳出內圈迴圈
if (i==2){ break innerloop;}
//
跳出外圈迴圈
if (i==4){ break outerloop;}
document.write( "i
= " +i+ "
, j = " +j+ "<br
/>" );
}
}
document.write( "final" + "
i = " +i+ "
, j = " +j);
</script>
|
程式執行結果:
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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迴圈不能用break,否則會報錯。退出each迴圈應該用return false,如:
var clientName = $("#clientName").val();
$.each(avaiableTags,function(key,value){
if(value == clientName){return false;}
});