jQuery 中 ajaxSend() 和 ajaxStart() 函数有什么区别?
ajaxSend() 方法
ajaxSend(callback) 方法附加一个函数,该函数在每次发送 AJAX 请求时都会执行。
以下是此方法使用到的所有参数的描述
- callback − 要执行的函数。XMLHttpRequest 和用于该请求的设置作为参数传递给回调函数。
假设我们在 result.html 文件中有以下 HTML 内容
<h1>THIS IS RESULT...</h1>
示例
以下是一个显示此方法用法的示例
<html> <head> <title>The jQuery Example</title> <script src = "https://ajax.googleapis.com/ajax/libs/jquery/2.1.3/jquery.min.js"></script> <script> $(document).ready(function() { /* Global variable */ var count = 0; $("#driver").click(function(event){ $('#stage0').load('result.html'); }); /* Gets called when request starts */ $(document).ajaxStart(function(){ count++; $("#stage1").html("<h1>Starts, Count :" + count + "</h1>"); }); /* Gets called when request is sent */ $(document).ajaxSend(function(evt, req, set){ count++; $("#stage2").html("<h1>Sends, Count :" + count + "</h1>"); $("#stage2").append("<h1>URL :" + set.url + "</h1>"); }); /* Gets called when request complete */ $(document).ajaxComplete(function(event,request,settings){ count++; $("#stage3").html("<h1>Completes, Count :" + count + "</h1>"); }); }); </script> </head> <body> <p>Click on the button to load result.html file:</p> <div id = "stage0" style = "background-color:blue;"> STAGE - 0 </div> <div id = "stage1" style = "background-color:blue;"> STAGE - 1 </div> <div id = "stage2" style = "background-color:blue;"> STAGE - 2 </div> <div id = "stage3" style = "background-color:blue;"> STAGE - 3 </div> <input type = "button" id = "driver" value = "Load Data" /> </body> </html>
ajaxStart() 方法
ajaxStart( callback ) 方法附加一个函数,该函数在每次 AJAX 请求开始并且没有其他活动请求时执行。
以下是此方法使用到的所有参数的描述:
- callback − 要执行的函数。
假设我们在 result.html 文件中有以下 HTML 内容
<h1>THIS IS RESULT...</h1>
示例
以下是一个显示此方法用法的示例
<html> <head> <title>The jQuery Example</title> <script src = "https://ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script> <script> $(document).ready(function() { /* Global variable */ var count = 0; $("#driver").click(function(event){ $('#stage1').load('result.html'); }); /* Gets called when request starts */ $(document).ajaxStart(function(){ count++; $("#stage2").html("<h1>Starts, Count :" + count + "</h1>"); }); /* Gets called when request complete */ $(document).ajaxComplete(function(event,request,set){ count++; $("#stage3").html("<h1>Completes,Count:" + count + "</h1>"); }); }); </script> </head> <body> <p>Click on the button to load result.html file:</p> <div id = "stage1" style = "background-color:blue;"> STAGE - 1 </div> <div id = "stage2" style = "background-color:blue;"> STAGE - 2 </div> <div id = "stage3" style = "background-color:blue;"> STAGE - 3 </div> <input type = "button" id = "driver" value = "Load Data" /> </body> </html>
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