退出forEach

try {  var arr = [1, 2, 3, 4];  arr.forEach(function (item, index) {    //跳出条件    if (item === 3) {      throw new Error("LoopTerminates");    }    //do something    console.log(item);  });} catch (e) {  if (e.message !== "LoopTerminates") throw e;};

参考链接:缩小for的应用