ajax 如何獲取nodejs服務(wù)端返回的數(shù)據(jù) ？ 服務(wù)端如何寫 ajax才能獲得數(shù)據(jù)？nodejs后端：var express=require('express');var app = express();var data=[1,2,3,4];var port=3000;app.listen(port);console.log("server is running on port :"+port);app.get('/',function(req,res){? res.send(JSON.stringify(data)); ?});ajax前端代碼：?<script>???? $(document).ready(function(){????? $("#bt1").click(function(){???? ??? ?$.ajax({ ??? ??? ??? ????? url: 'http://127.0.0.1:3000/',? ?? ??? ??? ????? success: function(data) { ??? ??? ??? ????????? alert(data);?? ??? ??? ????? }, ??? ??? ??? ????? error: function() { ??? ??? ??? ????????? alert('error '); ??? ??? ??? ????? } ??????????????? });????? });???? });??? </script>這樣寫無法取得數(shù)據(jù) ？求大神？？？？？？幫忙