上一篇文章写到原生js取代jquery的一些常用函数：

function ajax(){

var ajaxData = {

type:arguments[0].type || "GET",

url:arguments[0].url || "",

async:arguments[0].async || "true",

data:arguments[0].data || null,

dataType:arguments[0].dataType || "text",

contentType:arguments[0].contentType || "application/x-www-form-urlencoded",

beforeSend:arguments[0].beforeSend || function(){},

success:arguments[0].success || function(){},

error:arguments[0].error || function(){}

}

ajaxData.beforeSend()

var xhr = createxmlHttpRequest();

xhr.responseType=ajaxData.dataType;

xhr.open(ajaxData.type,ajaxData.url,ajaxData.async);

xhr.setRequestHeader("Content-Type",ajaxData.contentType);

xhr.send(convertData(ajaxData.data));

xhr.onreadystatechange = function() {

if (xhr.readyState == 4) {

if(xhr.status == 200){

ajaxData.success(xhr.response)

}else{

ajaxData.error()

}

}

}

}

function createxmlHttpRequest() {

if (window.ActiveXObject) {

return new ActiveXObject("Microsoft.XMLHTTP");

} else if (window.XMLHttpRequest) {

return new XMLHttpRequest();

}

}

function convertData(data){

if( typeof data === 'object' ){

var convertResult = "" ;

for(var c in data){

convertResult+= c + "=" + data[c] + "&";

}

convertResult=convertResult.substring(0,convertResult.length-1)

return convertResult;

}else{

return data;

}

}

使用格式跟jquery的ajax差不多：

ajax({

type:"POST",

url:"ajax.php",

dataType:"json",

data:{"val1":"abc","val2":123,"val3":"456"},

beforeSend:function(){

//some js code

},

success:function(msg){

console.log(msg)

},

error:function(){

console.log("error")

}

})

以上就是小编为大家带来的原生js实现ajax方法(超简单)的全部内容了，希望对大家有所帮助，多多支持脚本之家~