花了比较久的时间去理解，码字。
记录防老。
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">
<title></title>
<style>
</style>
</head>
<body>
<button id="btn">点我测试</button>
<script>
function ajax(opts) {
var xhr = new XMLHttpRequest();
var dataArr = [];
var param = '';
for (key in opts.data) {
param = param + key + "=" + opts.data[key] + '&';
}
param = param.substr(0,param.length-1)
if (opts.type === 'get') {
getType()
} else if (opts.type === 'post') {
postType()
}
function getType() {
xhr.onreadystatechange = function() {
if (xhr.readyState === 4) {
if (xhr.status === '200' || '304') {
var results = JSON.parse(xhr.response)
opts.success(results)
} else {
opts.error()
}
}
isDataloaded = true
}
isDataloaded = false
xhr.open(opts.type, opts.url +"?"+param, true);
xhr.send();
}
function postType() {
xhr.onreadystatechange = function() {
if (xhr.readyState === 4) {
if (xhr.status === '200' || '304') {
var results = JSON.parse(xhr.response)
opts.success(results)
} else {
opts.error()
}
}
isDataloaded = true
}
isDataloaded = false
xhr.open(opts.type, opts.url, true);
xhr.setRequestHeader("Content-Type","application/x-www-form-urlencoded")
xhr.send(param);
}
}
var isDataloaded = true
document.querySelector('#btn').addEventListener('click', function(){
ajax({
url: '/login', //接口地址
type: 'get', // 类型， post 或者 get,
data: {
username: 'xiaoming',
password: 'abcd1234'
},
success: function(ret){
console.log(ret); // {status: 0}
},
error: function(){
console.log('出错了')
}
})
})
</script>
</body>
</html>
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