This time I will bring you the use of $. and $(). in jQuery. What are the precautions for using $. and $(). in jQuery. The following is a practical case. Let’s take a look. one time.
People like me who have not studied systematically always have this problem:(
$ is another name for jQuery
and jQuery is a function provided by the jQuery library .(It seems that it is not just a function, because there is also the use of $.ajax(options), which is equivalent to jQuery.ajax(options))
The function of this function is to search and sum based on the parameters in () To select elements in html documents, one of the function functions is to replace GetElementByID, but () can not only be ID, but also various class selectors
For example:
$(document) selects the entire document object
. Can it only be replaced by $? No. In order to prevent naming conflicts, the jQuery library provides Another mechanism to give jQuery functions another alias.
For example:
var jq = jQuery.noConflict(); // Do something with jQuery j("p p").hide(); // Do something with another library's $() $("content").style.display = 'none';
You can use jq instead of jQuery and $ in the code.
Let’s take a look at the difference between using $. and $(). in jquery, and what are their respective meanings?
$ is the jquery object, $() is jQuery (), you can pass parameters in it, and its function is to get the element
The following example
$(".p1") 表示获取类名为p1的元素,例如获取<p></p> $(".p1").onclick表示类名为p1的p点击事件 jquery中$.,例如$.post(),$.get(),$.ajax()等这些都是jquery这个对象的方法
I believe you have mastered the method after reading the case in this article. For more exciting information, please pay attention to other related articles on the PHP Chinese website !
Recommended reading:
How to use Vue to write a two-way data binding
How to implement the React diff algorithm
The above is the detailed content of Use of $. and $(). in jQuery. For more information, please follow other related articles on the PHP Chinese website!

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。

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。

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。

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。

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。


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