


The example in this article describes how jQuery simply implements a loading progress bar when submitting data. Share it with everyone for your reference, the details are as follows:
The html part of the code is as follows, copy and import the class library to use
<html> <head> <style type="text/css"> #bg{ display: none; position: absolute; top: 0%; left: 0%; width: 100%; height: 100%; background-color: black; z-index:1001; -moz-opacity: 0.2; opacity:.2; filter: alpha(opacity=70);} .loading{display: none; position: absolute; top: 50%; left: 50%; z-index:1002; } </style> </head> <body> <div id="bg"></div> <input type="button" value="Save" id="btnSave" name="btnSave" /> <div class="loading"><img src="/static/imghwm/default1.png" data-src="loading.gif" class="lazy" alt="jQuery simply implements the method of submitting data and showing loading progress bar_jquery" ></div> </body> </html>
Part of the jQuery code is as follows:
<script src="jquery-1.11.0.min.js" type="text/javascript"></script><!--自己下载类库--> <script type="text/javascript"> $(function(){ $("#btnSave").click(function(){ $("#bg,.loading").show(); $.ajax({ async:false, url:"time.php", type:"post", data:{}, success:function(mes){ $("#bg,.loading").show(); } }) }) }) </script>
php code:
for($i=0;$i<10000000;$i++){ }
Readers who are interested in more jQuery related content can check out the special topics on this site: "JQuery switching effects and techniques summary", "jQuery drag effects and techniques summary", "JQuery extension skills summary", "jQuery common classic special effects summary", "jQuery animation and special effects usage summary", "jquery selector usage Summary " and "Summary of jQuery common plug-ins and usage "
I hope this article will be helpful to everyone in jQuery programming.

实现方法:1、用“$("img").delay(毫秒数).fadeOut()”语句,delay()设置延迟秒数;2、用“setTimeout(function(){ $("img").hide(); },毫秒值);”语句,通过定时器来延迟。

修改方法:1、用css()设置新样式,语法“$(元素).css("min-height","新值")”;2、用attr(),通过设置style属性来添加新样式,语法“$(元素).attr("style","min-height:新值")”。

区别:1、axios是一个异步请求框架,用于封装底层的XMLHttpRequest,而jquery是一个JavaScript库,只是顺便封装了dom操作;2、axios是基于承诺对象的,可以用承诺对象中的方法,而jquery不基于承诺对象。

增加元素的方法:1、用append(),语法“$("body").append(新元素)”,可向body内部的末尾处增加元素;2、用prepend(),语法“$("body").prepend(新元素)”,可向body内部的开始处增加元素。

在jquery中,apply()方法用于改变this指向,使用另一个对象替换当前对象,是应用某一对象的一个方法,语法为“apply(thisobj,[argarray])”;参数argarray表示的是以数组的形式进行传递。

删除方法:1、用empty(),语法“$("div").empty();”,可删除所有子节点和内容;2、用children()和remove(),语法“$("div").children().remove();”,只删除子元素,不删除内容。

去掉方法:1、用“$(selector).removeAttr("readonly")”语句删除readonly属性;2、用“$(selector).attr("readonly",false)”将readonly属性的值设置为false。

on()方法有4个参数:1、第一个参数不可省略,规定要从被选元素添加的一个或多个事件或命名空间;2、第二个参数可省略,规定元素的事件处理程序;3、第三个参数可省略,规定传递到函数的额外数据;4、第四个参数可省略,规定当事件发生时运行的函数。


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