超链接的那些事(二): 属性href_html/css_WEB-ITnose-HTML Tutorial-php.cn

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超链接的那些事(二): 属性href_html/css_WEB-ITnose

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Jun 24, 2016 am 11:35 AM

a标签的属性之一 href

1. 定义

href 属性用于指定超链接目标的 URL。

2. 用法

①. 锚点

同一页面添加锚点

（1）连接到本页面的锚的超链接 //点击的连接

（2）锚 //放到要跳转内容的地方

跨页面添加锚点

（1）在test2.html创建锚锚

（2）在test1.html设置好连接连接到另外页面的锚的超链接

②. 下载

<a href="download.rar"></a>

href中的url需要有效，文件最好是rar格式

③. 打电话

<a href="tel:电话号码"></a>

　 ④. 邮箱

邮箱标签: mailto

属性： cc: 抄送

bcc: 暗抄

subject：主题

body：邮箱内容

常规

利用逗号(,) 多地址发送

利用属性

　　⑤. Javascript

直接调用javascript

W3C标准不推荐在href里面执行javascript语句.这种方法在传递this等参数的时候很容易出问题，而且javascript:协议作为a的href属性的时候不仅会导致不必要的触发window.onbeforeunload事件，在IE里面更会使gif动画图片停止播放。

使用void, ::, undefined, 配合onclick

最常用的方法，也是最周全的方法，地址不发生跳转，不会在地址栏暴露Js方法

'#'和onclick

'#'是标签内置的一个方法，代表top的作用，所以执行方法后返回页面最顶端。

执行'return false'后，页面不发生跳转，页面停留在当前位置。

未完待续....

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