Lyrics

< More and better />

跨域

CORS

js 

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$.ajax({
               url: 'http://localhost:3000/sign',
               type: 'POST',
               dataType :'JSON',
               data:Obj,
               xhrFields:   {'Access-Control-Allow-Origin': '*'}, //CORS跨域指定 + dataType
               success:function(data){
                       // alert("fff");
                       console.log(data)
               },
               error:function(err){
                   // console.log("err"+err);
               }
           });

node

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//后端,服务器端
 res.header("Access-Control-Allow-Origin", "*");
 //跨域
app.all('*', function(req, res, next) {
    res.header("Access-Control-Allow-Origin", "*");
    res.header("Access-Control-Allow-Headers", "X-Requested-With");
    res.header("Access-Control-Allow-Methods","PUT,POST,GET,DELETE,OPTIONS");
    res.header("X-Powered-By",' 3.2.1')
    res.header("Content-Type", "application/json;charset=utf-8");
    next();
});

Jsonp

js 

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$.ajax({
           url: 'http://localhost:3000/check',
           type: 'GET',
           cache: false,
           dataType: 'jsonp',
           data: { 'data': content.value },
           jsonp: 'callback',
           jsonpCallback: 'handler',
           xhrFields: {
               withCredentials: true
           }, //设置发送cookie
           crossDomain: true,
           // success: handler,
           error: function(jq, err, text) {
               alert(err.message);
           }
       });