写如下代码：
1
931 request = new XMLHttpRequest();
request.open('GET', url, true);
request.onreadystatechange = function() {
if (request.status >= 200 && request.status < 400){
// Success!
data = JSON.parse(request.responseText);
console.log(data);
if(data.ret == 1){
window.location = data.url;
}
}
};
request.send();
发现会提示：
XMLHttpRequest cannot load http://XXXXX.com/app.php?callback=cb. No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'http://www.YYYY.com' is therefore not allowed access.
如何实现类似getJSON的JSONP跨域呢？
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