9. Comments in JavaScript
Q: How do I insert comments in JavaScript code?
A: JavaScript supports three different types of comments:
Multiline C-style comments. Content included in /* and */ are comments, for example:
/* This is a comment */
/* C-style comments can span
as many lines as you like,
as shown in this example */
C-style single-line comments. These comments start with // and end at the end of the line:
// This is a one-line comment
Use an HTML comment to start the sequence (). Consider this example:
This is also a one- line JS comment
because JS ignores the closing characters
of HTML-style comments
HTML-style comments are not common in JavaScript code. (//The single-line comment of the guide is simpler and more readable). However, it is highly recommended to use HTML comments to hide JavaScript code from older browsers.
10. Hidding JS code from old browsers (Hidding JS code from old browsers)
Q: How do I hide JS code from old versions that do not support JavaScript?
A: In order to prevent older browsers from displaying JS code, you can use the following method:
At the beginning of the
, your HTML file will contain the following code end:
Older versions of browsers will treat JS code as a long HTML comment. On the other hand, browsers that support JavaScript will interpret the JS code between
normally (the interpreter will treat the first and last lines in the JS code as single-line comments). Q: If the user's browser cannot execute JavaScript code, can I give the user a warning?
A: Of course, you can display a specific warning to users using non-JavaScript-compatible browsers. Place your warning message between
Browsers that support JavaScript will ignore the content between

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!

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对象的构造函数和new操作符,构造函数是所有对象的成员方法中,最早被调用的那个,下面一起来看一下吧,希望对大家有帮助。

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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