Javascript跨域

Javascript跨域

1 function createCORSRequest(method, url) {
2    var xhr = new XMLHttpRequest();
3    if ("withCredentials" in xhr) {
4       xhr.open(method, url, true);
5    } else if (typeof XDomainRequest!= "undefined") {
6       xhr = new XDomainRequest();
7       xhr.open(method, url);
8    } else {
9      // 否则，浏览器不支持CORS
10      xhr = null;
11    }
12    return xhr;
13 }