var requestJsonp = function (opt) {
var funName, script;
/*
* step1 創(chuàng)建_callback方法
*/ 
//_callback函數名
funName = '_cb' + (Math.random() * 1000000);
//創(chuàng)建_callback方法
window[funName] = function (data) {
if (typeof opt.success == 'function') {
opt.success(data);
}
window[funName] = null;
delete window[funName];
document.body.removeChild(script);
script = null;
};
/*
* step2 插入script標簽
*/
script = document.createElement('script');
script.type = 'text/javascript';
script.src = opt.url + (opt.url.indexOf('?') > -1 ? '&' : '?') + '_callback=' + funName;
document.body.appendChild(script);
/*
* step3 服務器輸出js
* 服務器應接受url參數中_callback的值,作為函數名執(zhí)行輸出js
* 類似輸出
* _callback({"name":"jsonp","description":"jsonp test"});
*/ 
/*
* 處理error
*/
script.addEventListener('error', function () {
window[funName] = null;
delete window[funName];
if (typeof opt.error == 'function') {
opt.error();
}
document.body.removeChild(script);
script = null;
});
};
requestJsonp({
url: 'http://www.url.org?tid=Jsx2',
success: function (data) {
console.log(data);
},
error: function () {
console.log('request error!');
}
});