"的javascript：;"用于HTML锚标记中的href属性 [英] "javascript:;" for href attribute in HTML anchor tag

问题描述

更新

以下代码意味着什么？它需要JavaScript来工作？

 < a href =javascript：;> Do Somthing< / a> 
  

更新

等于低于？：

 < a href => Do Somthing< / a> 
  

解决方案

使用javascript：作为href的开始属性链接告诉JavaScript引擎使用字符串的其余部分被解释为JavaScript。在这种情况下，严格解释会导致语法错误，因为这实际上是一个带有分号结束的空javascript线。像这样：

 ; 
  

然而，大多数浏览器不会抛出错误，因为链接上的JavaScript是旧的语法，应该是尽可能避免。您可以安全地使用它作为一个什么都不做的链接，但我不会推荐它。

如果你想要一个链接什么都不做，你可以用它来代替：

 < a href =＃>连结< / a> 
< a href =javascript：void（0）;>连结< / a> 
< a href =javascript：return false;>连结< / a> 
  

使用空href字符串将使浏览器将其解释为相对链接。不以协议或标识符（如高级域或IP地址）开头的URL将被视为相对链接。例如，域google.com上的链接index.htm将创建链接 google.com/index.htm。同样，href字符串会创建链接google.com /，所以空href字符串将导致浏览器导航到新页面。

通常情况下，链接不会显示指针光标，也不会像链接那样格式化元素（如果未指定href属性，因此您可以将它用作锚点元素，您可以将其链接到在URL中使用哈希字符。例如http://google.com/#an_anchor会将您带到类似以下的锚点：< a id =an_anchor >这是一个锚< / a>

然而，您可以使用CSS强制链接被格式化，如下所示：

CSS：

  a {
颜色：＃00c ; 
 text-decoration：下划线; 
光标：指针; 
} 
  

HTML：

 < a>这是一个链接。< / a> 
  

示例： http： //jsfiddle.net/J3RfH/

Update

What does the code below mean and do? It needs JavaScript to work?

<a href="javascript:;">Do Somthing</a>

Update

Is equal to below?:

<a href="">Do Somthing</a>

解决方案

Using "javascript:" as the start of a href attribute to a link tells the javascript engine to use the rest of the string to be interpreted as javascript. In this case, it would cause a syntax error in strict interpretation, since this is effectively an empty javascript line with a closing semicolon. Like this:

;

Most browsers won't throw an error, however, as javascript on links are old syntax and should be avoided when possible. You could safely use it as a link that does nothing, however I wouldn't recommend it.

If you want a link to do nothing, you could use this instead:

<a href="#">Link</a>
<a href="javascript:void(0);">Link</a>
<a href="javascript:return false;">Link</a>

Using an empty href string will make the browser interpret it as a relative link. URLs that don't start with a protocol or an identifier like a high level domain or IP address will be treated as relative links. For example, the link "index.htm" on the domain "google.com" will create the link "google.com/index.htm". In the same way, the href string "" will create the link "google.com/" and so empty href strings will cause the browser to navigate to a new page.

Normally a link will not show the pointer cursor or format the element like a link if you do not specify a href attribute, this is so you can use it as an "anchor" element that you can link to using the hash character in a URL. Such as "http://google.com/#an_anchor" will take you to an anchor similar to this: <a id="an_anchor">This is an anchor</a>

However you can use CSS to force the link to be formatted, like this:

CSS:

a {
    color: #00c;
    text-decoration: underline;
    cursor: pointer;
}

HTML:

<a>This is a link.</a>

Example: http://jsfiddle.net/J3RfH/

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