var now = new Date(); 
        var exitTime = now.getTime() + numberMillis; //numberMillis毫秒超时参数
        while (true) { try {
                  //逻辑处理  
          // 如果符合可以直接return "";
}catch(ignored) {
          //exception }
now = new Date(); if (now.getTime() > exitTime){return ""; } }

 

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