Detailed explanation of code for using ajax and jsonp in javascript

Ajax request

##jquery ajax function

encapsulates an ajax function, the code is as follows:

var Ajax = function(url, type success, error) {
$.ajax({
url: url,
type: type,
dataType: 'json',
timeout: 10000,
success: function(d) {
var data = d.data;
success && success(data);
},
error: function(e) {
error && error(e);
}
});
};
// 使用方法：
Ajax('/data.json', 'get', function(data) {
console.log(data);
});

jsonp method

Sometimes we have to use the jsonp method in order to cross domains, which is also encapsulated A function:

function jsonp(config) {
var options = config || {}; // 需要配置url, success, time, fail四个属性
var callbackName = ('jsonp_' + Math.random()).replace(".", "");
var oHead = document.getElementsByTagName('head')[0];
var oScript = document.createElement('script');
oHead.appendChild(oScript);
window[callbackName] = function(json) { //创建jsonp回调函数
oHead.removeChild(oScript);
clearTimeout(oScript.timer);
window[callbackName] = null;
options.success && options.success(json); //先删除script标签，实际上执行的是success函数
};
oScript.src = options.url + '?' + callbackName; //发送请求
if (options.time) { //设置超时处理
oScript.timer = setTimeout(function () {
window[callbackName] = null;
oHead.removeChild(oScript);
options.fail && options.fail({ message: "超时" });
}, options.time);
}
};
// 使用方法：
jsonp({
url: '/b.com/b.json',
success: function(d){
//数据处理
},
time: 5000,
fail: function(){
//错误处理
} 
});

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