Let’s put it this way, only with a solid foundation in JavaScript can you use various JS libraries with ease, and then let’s get to the point!
1. Let’s talk about the efficiency of JQuery first
He The speed of the selector is about 4 times slower than the standard JS Dom (officially said, I am not making it up...), so why do we still use it? The reason is very simple, the first JS is For client-side applications, the speed impact is not so obvious, but you must pay attention to when to use JQuery selectors and when to use JavaScript selectors!
This is my personal understanding, if the logic is easier when selecting objects Then don't use JQuery's selector, such as
Then just do simple verification, no complicated operations, just use document.getElementById("name" );
Don’t use JQuery’s $("#ID") just because it looks convenient, but if you want to do more complex and logical operations, use JQuery. For example, there are 10
When we want to delete the rows they are in after checking
$("input[checked]").parent().parent().remove(); This way of writing is in It is better in terms of logic and maintainability!
2. Let’s talk about cross-browser aspects
Generally, when writing JavaScript, there is code. If you want to run on different browsers, some methods The problem is that it is not supported by the browser and must be modified. JQuery has done a better job in this regard and supports mainstream browsers, so that one code can be used on multiple browsers
3. Next, let’s talk about "Zonghai Development"
Nowadays development emphasizes high speed, high quality and easy maintenance. It can be written from scratch using traditional JavaScript, but it will cause problems in the development progress. It has a great impact, and JQuery has a rich plug-in library, which greatly improves development efficiency. You may say that with so many plug-in libraries, just looking at the API is exhausting, but JQuery has done a good job in this regard. Each plug-in has Detailed comments and Domo make it easy to put it into practical applications.
This is my first time writing something. Don’t be angry if I don’t write well. The next article will introduce some techniques for applying JavaScript and JQuery in actual development. ,Thank you

去掉重复并排序的方法:1、使用“Array.from(new Set(arr))”或者“[…new Set(arr)]”语句,去掉数组中的重复元素,返回去重后的新数组;2、利用sort()对去重数组进行排序,语法“去重数组.sort()”。

本篇文章给大家带来了关于JavaScript的相关知识,其中主要介绍了关于Symbol类型、隐藏属性及全局注册表的相关问题,包括了Symbol类型的描述、Symbol不会隐式转字符串等问题,下面一起来看一下,希望对大家有帮助。

怎么制作文字轮播与图片轮播?大家第一想到的是不是利用js,其实利用纯CSS也能实现文字轮播与图片轮播,下面来看看实现方法,希望对大家有所帮助!

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本篇文章给大家带来了关于JavaScript的相关知识,其中主要介绍了关于面向对象的相关问题,包括了属性描述符、数据描述符、存取描述符等等内容,下面一起来看一下,希望对大家有帮助。

方法:1、利用“点击元素对象.unbind("click");”方法,该方法可以移除被选元素的事件处理程序;2、利用“点击元素对象.off("click");”方法,该方法可以移除通过on()方法添加的事件处理程序。

本篇文章给大家带来了关于JavaScript的相关知识,其中主要介绍了关于BOM操作的相关问题,包括了window对象的常见事件、JavaScript执行机制等等相关内容,下面一起来看一下,希望对大家有帮助。

foreach不是es6的方法。foreach是es3中一个遍历数组的方法,可以调用数组的每个元素,并将元素传给回调函数进行处理,语法“array.forEach(function(当前元素,索引,数组){...})”;该方法不处理空数组。


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