function jsonp(options) {
options = options || {};
if (!options.url || !options.callback) {
throw new Error("参数不合法");
}
//创建 script 标签并加入到页面中
var callbackName = ('jsonp_' + Math.random()).replace(".", "");
var oHead = document.getElementsByTagName('head')[0];
options.data[options.callback] = callbackName;
var params = formatParams(options.data);
var oS = document.createElement('script');
oHead.appendChild(oS);
//创建jsonp回调函数
window[callbackName] = function (json) {
oHead.removeChild(oS);
clearTimeout(oS.timer);
window[callbackName] = null;
options.success && options.success(json);
};
//发送请求
oS.src = options.url + '?' + params;
//超时处理
if (options.time) {
oS.timer = setTimeout(function () {
window[callbackName] = null;
oHead.removeChild(oS);
options.fail && options.fail({ message: "超时" });
}, time);
}
};
//格式化参数
function formatParams(data) {
var arr = [];
for (var name in data) {
arr.push(encodeURIComponent(name) + '=' + encodeURIComponent(data[i]));
}
return arr.join('&');
}
