//版权 北京智能社©, 保留所有权利

//options: url data cbName timeout success error

function jsonp(options){

options = options ||{};

if(!options.url){

return ;

}

options.data = options.data || {};

options.cbName = options.cbName || "cb";

options.timeout = options.timeout || 0;

var fnName = ("jsonp_" + Math.random()).replace(".","");

var arr = [];

options.data[options.cbName] = fnName;

for(var name in options.data){

arr.push(name + "=" + encodeURIComponent(options.data[name]));

}

var str = arr.join("&");

//全局函数

window[fnName] = function(json){

options.success && options.success(json);

//释放资源

window[fnName] = null;

oHead.removeChild(oS);

clearTimeout(timer);

};

//创建script

var oS = document.createElement("script");

oS.src = options.url + "?" + str;

var oHead = document.getElementsByTagName("head")[0];

oHead.appendChild(oS);

//超时

if(options.timeout){

var timer = setTimeout(function(){

options.error && options.error();

window[fnName] = function(){};

oHead.removeChild(oS);

},options.timeout);

}

}