JavaScript的Ajax封裝GET和POST
阿新 • • 發佈：2018-09-05
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<!DOCTYPE html>
<html>
<head>
<title>封裝ajax</title>
</head>
<body>
<script type="text/javascript">
function createXHR()
{
if(typeof XMLHttpRequest != "undefined")
{
return new XMLHttpRequest();
}
else if(typeof ActiveXObject != "undefined")
{
var versions = [
"MSXML.2.XMLHttp.6.0",
"MSXML.2.XMLHttp.3.0",
"MSXML.2.XMLHttp"
];
for(var i = 0; i<versions.length;i++)
{
try{
return new ActiveXObject(version[i]);
}catch(e){
// 因類循環會報一個錯，跳過些錯
}
}
}
else
{
throw new Error("你的系統或瀏覽器不支持XHR對象！");
}
}
// 名值對轉換字符串
function params(data)
{
var arr = [];
for(var i in data)
{
arr.push(encodeURIComponent(i)+"="+encodeURIComponent(data[i]));
}
return arr.join("&");
}
// ajax
function ajax(obj)
{
var xhr=createXHR();
obj.url=obj.url+"?rand="+Math.random();
obj.data = params(obj.data);
if(obj.method === "GET")
{
obj.url+=obj.url.indexOf("?") == -1 ?"?"+ obj.data:"&"+obj.data;
}
// if it‘s asynchronous
if(obj.async === true)
{
xhr.onreadystatechange = function()
{
if(xhr.readyState == 4)
{
callback();
}
}
}
xhr.open(obj.method,obj.url,obj.async);
if(obj.method === "POST")
{
xhr.setRequestHeader("Content-Type","application/x-www-form-urlencoded");
xhr.send(obj.data);
}
else
{
xhr.send(null);
}
// iF It‘s synchronization
if(obj.async === false)
{
callback();
}
// 封裝重復調用代碼
function callback()
{
if(xhr.status === 200)
{
obj.success(xhr.responseText);
}
else
{
alert("錯誤代碼："+xhr.status+"-錯誤信息："+xhr.statusText);
}
}
}
// use ajax
addEventListener("click",function(){
ajax({
method:"POST",
url:"test.php",
data:{
"na&me":"ping",
"age":18
},
// 將對象傳到text，然後對象又回調
success:function(text)
{
console.log("接收success數據為："+text);
},
async:false
});
},false);
</script>
</body>
</html>JavaScript的Ajax封裝GET和POST