cocos2d-js cross-domain access problem, cocos2d-js requests network data

The following is the code for cocos2d-js to request network data:

var HttpRequest = {
    /*
     * 网络请求之GET
     * url 请求的网络地址
     * callback 回调参数
     * */
    GET:function(url,callback){
        var xhr = cc.loader.getXMLHttpRequest();
        xhr.open("GET",url,true);
        xhr.onreadystatechange = function () {
            if (xhr.readyState == 4 && (xhr.status >= 200 && xhr.status <= 207)) {
                err = false;
            }else{
                err = true;
            }
            var response = xhr.responseText;
            callback(err,response);
        };
        xhr.send();
    },
    /*
     * 网络请求之POST
     * url 请求的网络地址
     * params  请求参数  ("id=1&id=2&id=3")
     * callback 回调参数
     * */
    POST:function(url,params,callback){
        var nums = arguments.length
        if(nums == 2){
            callback = arguments[1];
            params = "";
        }
        var xhr = cc.loader.getXMLHttpRequest();
        xhr.open("POST", url);
        xhr.setRequestHeader("Content-Type","text/plain;charset=UTF-8");
        xhr.onreadystatechange = function () {
            if (xhr.readyState == 4 && (xhr.status >= 200 && xhr.status <= 207)) {
                err = false;
            }else{
                err = true;
            }
            var response = xhr.responseText;
            callback(err,response);
        };
        xhr.send(params);
    }
}

//EXMAPLE
/*
 HttpRequest.POST("http://127.0.0.1:3000/test","id=1&ids=2", function(err,data){
 if(err){
 //错误处理
 }else{
 cc.log(data);
 }
 })
 */

However, the request network appears: No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'http://localhost: 63342' is therefore not allowed access.

This is because the browser cannot access cross-domain. We find the file to be requested on the server side: set the header

<?php 
header("Access-Control-Allow-Origin : *");
echo "I Love you"
?>

In this way, the data is returned successfully? but! ! ! , failed, dizzy, the reason is that this php cannot have any output before calling the header, the encoding must be changed to UTF-8 without rom format, I got stuck at this point all night! ! !

The above introduces the cross-domain access issue of cocos2d-js. Cocos2d-js requests network data, including aspects of it. I hope it will be helpful to friends who are interested in PHP tutorials.