标签break

ES6 使用break标签

一个标签可以用于中断，并继续更精确地控制流量。

实例

outerloop: // This is the label name  
for (var i = 0; i < 5; i++) {  
   console.log("Outerloop: " + i);  
   innerloop:  

   for (var j = 0; j<5; j++) {  
      if (j>3 ) break;

      // Quit the innermost loop  
      if (i == 2) break innerloop;

      // Do the same thing  
      if (i == 4) break outerloop; // Quit the outer loop  
      console.log("Innerloop: " + j);  
   }  
}

在成功执行上述代码时，会显示以下输出。

Outerloop: 0
Innerloop: 0
Innerloop: 1
Innerloop: 2
Innerloop: 3
Outerloop: 1
Innerloop: 0
Innerloop: 1
Innerloop: 2
Innerloop: 3
Outerloop: 2
Outerloop: 3
Innerloop: 0
Innerloop: 1
Innerloop: 2
Innerloop: 3
Outerloop: 4