Native js implements ajax request method
This time I will bring you native js to implement ajax request method, what are the precautions for native js to implement ajax request method, the following is a practical case, let's take a look.
The previous article wrote about some common functions that native js replaces jquery: Native js imitates some common methods of jquery, then, ajax How to achieve this? The following is a relatively complete ajax()
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; } }
The usage format is similar to jquery’s ajax:
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") } })
I believe you have mastered the method after reading the case in this article. For more exciting information, please pay attention to the php Chinese website Other related articles!
Recommended reading:
Detailed explanation of Ajax operation cases in JQuery
jQuery Ajax analysis collection
The above is the detailed content of Native js implements ajax request method. For more information, please follow other related articles on the PHP Chinese website!

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