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35 lines (29 loc) · 803 Bytes
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Appearance.js
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35 lines (29 loc) · 803 Bytes
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function ajaxCall(type, url, callback, data) {
let xhr = (function(){
try {
// 标准方法
return new XMLHttpRequest()
}catch(e){}
try {
return new ActiveXObject("Msxm12.XMLHTTP")
}catch(e){}
}())
STATE_LOADED = 4
STATUS_OK = 200
// 一但从服务器收到表示成功的相应消息，则执行所给定的回调方法
xhr.onreadystatechange = function () {
if (xhr.readyState !== STATE_LOADED) {
return
}
if (xhr.state == STATUS_OK) {
callback(xhr.responseText)
}
}
// 发出请求
xhr.open(type.toUpperCase(), url)
xhr.send(data)
}
// 使用封装的方法
ajaxCall("get", "/url/data", function(res) {
document.write(res)
})