This in jquery means "current object". This represents the current element in html. Use the "$(this)" statement to turn the html element into a jquery object, and then use the jquery method to process the current Object, the syntax is "$(this).jquery method name();".
The operating environment of this tutorial: windows10 system, jquery3.6.0 version, Dell G3 computer.
What does this mean in jquery
this is the dom object. To put it bluntly, it is the tags in html. $(this) is the dom object. The object is changed to a JQuery object, so that the Dom object can be processed using JQuery methods later.
First, let’s take a look at the $() symbol in JQuery. In fact, this symbol is equivalent to JQuery() in JQuery, that is, $(this)=jquery(); that is, this can return a jquery object. Then, when you alert($('#id')); on the web page, an [object Object] will pop up. This object object is also a jquery object.
The example is as follows:
<html> <head> <meta charset="utf-8"> <title>123</title> <script src="https://cdn.staticfile.org/jquery/3.6.0/jquery.min.js"> </script> <script> $(document).ready(function(){ $("p").click(function(){ $(this).hide();//$(this)是在方法click内,此处的$(this)表示的是当前调用click方法的对象$("p"),就是表示当前对象,当前调用该方法的对象 }); }); </script> </head> <body> <p>如果您点击我,我会消失。</p> <p>点击我,我会消失。</p> <p>也要点击我哦。</p> </body> </html>
Output result:
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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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