ES6 标签 label 和 break

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);  
   }  
}