This time I will bring you a detailed explanation of the method of using jQuery compound selector. What are the precautions when using jQuery compound selector? Here are practical cases, let’s take a look.
Introduction
The compound selector combines multiple selectors (can be ID selector, element selection or are class name selectors) are combined together, and the two selectors are separated by commas ",". As long as any one of the filter conditions is met, they will be matched. What is returned is a jQuery wrapper set in the form of a collection, using jQuery index The handler can get the jQuery objects in the collection.
Selectors with multiple matching conditions do not match elements that meet the matching conditions of these selectors at the same time. Instead, the elements matched by each selector are combined and returned together.
The method of using the compound selector is as follows:
$(" selector1,selector2,selectorN");
selector1: It is a valid selector, which can be an ID selector, an elementless selector or a class name selector, etc. .
selector2: It is another valid selector, which can be an ID selector, an elementless selector or a class name selector, etc.
selectorN: (optional) is any number of selectors, which can be ID selectors, elementless selectors, or class name selectors.
For example, to query all tags and tags using the CSS class myClass in a document, you can use the following jQuery code: Second Application Add 3 different elements to the page and set styles uniformly. Use a compound selector to filter elements and elements whose id attribute value is span and add new styles to them. Three codes Four running effects 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: $("span,p.myClass");
<script></script>
<p>p元素</p>
<p>p元素</p>
<span>ID为span的元素</span>
<input>
<script>
$(document).ready(
function()
{
$("input[type=button]").click(
function() //绑定按钮的单击事件
{
var myClass = $("p,#span"); //选取DOM元素
myClass.css("background-color","#C50210"); //为选取的DOM元素设置背景颜色
myClass.css("color","#FFF"); //为选取的DOM元素设置文字颜色
});
});
</script>
The above is the detailed content of Detailed explanation of using jQuery compound selector method. 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。

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。

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")”。

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。

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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