JavaScript封装Ajax（类JQuery中$.ajax()方法）
ajax.js
(function(exports, document, undefined){
"use strict";
function Ajax(){
if(!(this instanceof Ajax)) return;
return this;
}
Ajax.prototype = {
init: function(opts){
opts = opts || {};
this.opts = opts;
this.opts.type = opts.type || 'get';
this.opts.url = opts.url || '';
this.opts.data = opts.data || '';
this.opts.dataType = opts.dataType || 'text';
this.opts.async = opts.async || true;
this.opts.success = opts.success || null;
this.opts.error = opts.error || null;
this.xhr = this.createXMLHttpRequest.call(this);
this.initEvent.call(this);
return this;
},
ajax: function(opts){
this.init.apply(this, arguments);
this.open.call(this);
this.send.call(this);
},
createXMLHttpRequest: function(){
var xhr;
try{
xhr = new XMLHttpRequest();
}catch(e){
console.log(e);
}
return xhr;
},
initEvent: function(){
var _this = this;
this.xhr.onreadystatechange = function(){
if(_this.xhr.readyState == 4 && _this.xhr.status == 200){
if(_this.xhr.status == 200){
if(_this.opts.dataType === 'text' || _this.opts.dataType === 'TEXT'){
_this.opts.success && _this.opts.success(_this.xhr.responseText, 'success', _this.xhr);
}else if(_this.opts.dataType === 'xml' || _this.opts.dataType === 'XML'){
_this.opts.success && _this.opts.success(_this.xhr.responseXML, 'success', _this.xhr);
}else if(_this.opts.dataType === 'json' || _this.opts.dataType === 'JSON'){
_this.opts.success && _this.opts.success(JSON.parse(_this.xhr.responseText), 'success', _this.xhr);
}
}else if(_this.xhr.status != 200){
_this.opts.error && _this.opts.error(_this.xhr, 'error');
}
}
}
},
open: function(){
if(this.opts.type === 'GET' || this.opts.type === 'get'){
var str = (typeof this.opts.data === 'string') && this.opts.data || this.objectToString.call(this, this.opts.data),
url = (str === '') && this.opts.url || (this.opts.url.split('?')[0] + '?' + str);
this.xhr.open(this.opts.type, url, this.opts.async);
}else if(this.opts.type === 'POST' || this.opts.type === 'post'){
this.xhr.open(this.opts.type, this.opts.url.split('?')[0], this.opts.async);
}
return this;
},
send: function(){
if(this.opts.type === 'GET' || this.opts.type === 'get'){
this.xhr.send();
}else if(this.opts.type === 'POST' || this.opts.type === 'post'){
var str = (typeof this.opts.data === 'string') && this.opts.data || this.objectToString.call(this, this.opts.data);
this.xhr.setRequestHeader('content-type', 'application/x-www-form-urlencoded');
this.xhr.send(str);
}
},
objectToString: function(data){
if(typeof data !== 'object') return data;
var str = '';
for(var prop in data){
str += '&' + prop + '=' + data[prop];
}
return str.slice(1);
}
}
exports.Ajax = Ajax;
})(window, document);
ajax.php
<?php
$c = $_REQUEST['c'];
$arr = array(
'a'=>2014,
'b'=>array('c'=>$c)
);
echo json_encode($arr);
index.html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>ajax</title>
</head>
<body>
<script src="ajax.js"></script>
<script>
new Ajax().ajax({
type: 'get',
url: 'ajax.php?c=123', // 如果是get方式并且url包含参数，其参数会被data替代
// data: 'c=456', // data参数格式可以为字符串或对象
// data: {c: 456},
dataType: 'json',
async: false,
success: function(data, status, xhr){
console.log(data);
},
error: function(xhr, status){
console.log(xhr);
}
});
new Ajax().ajax({
type: 'post',
url: 'ajax.php?c=123', // 如果是get方式并且url包含参数，其参数会被data替代
data: 'c=456', // data参数格式可以为字符串或对象
// data: {c: 456},
dataType: 'text',
success: function(data, status, xhr){
console.log(data);
},
error: function(xhr, status){
console.log(xhr);
}
});
</script>
</body>
</html>
