Home Web Front-end HTML Tutorial HTML元素的ID和Name属性的区别_html/css_WEB-ITnose

HTML元素的ID和Name属性的区别_html/css_WEB-ITnose

Jun 24, 2016 am 11:24 AM

HTML元素的ID和Name属性的区别
今天突然兴致来了,想深究下这两属性的具体区别
最classical的答案:ID就像是一个人的身份证号码,而Name就像是他的名字,ID显然是唯一的,而Name是可以重复的。      显然这个ID和Name的解答说的太笼统了,当然那个解释对于ID来说是完全对的,它就是Client端HTML元素的Identity。而Name其实要复杂的多,因为Name有很多种的用途,所以它并不能完全由ID来代替,从而将其取消掉。具体用途有:
     用途1: 作为可与服务器交互数据的HTML元素的服务器端的标示,比如input、select、textarea、和button等。我们可以在服务器端根据其Name通过Request.Params取得元素提交的值。     

     用途2: HTML元素Input type='radio'分组,我们知道radio button控件在同一个分组类,check操作是mutex的,同一时间只能选中一个radio,这个分组就是根据相同的Name属性来实现的。     

     用途3: 建立页面中的锚点,我们知道link是获得一个页面超级链接,如果不用href属性,而改用Name,如:,我们就获得了一个页面锚点。     

     用途4: 作为对象的Identity,如Applet、Object、Embed等元素。比如在Applet对象实例中,我们将使用其Name来引用该对象。     

     用途5: 在IMG元素和MAP元素之间关联的时候,如果要定义IMG的热点区域,需要使用其属性usemap,使usemap="#name"(被关联的MAP元素的Name)。     

     用途6: 某些特定元素的属性,如attribute,meta和param。例如为Object定义参数或Meta中

 显然这些用途都不是能简单的使用ID来代替掉的,所以HTML元素的ID和Name的却别并不是身份证号码和姓名这样的区别,它们更本就是不同作用的东西。

    会提交数据

    不会提交数据

    这里的for属性必须是指向一个id,否则没效果

这里必须name相同才能成为一组单选按钮,而id则没有这个功能。
    对应脚本document.getElementsByName( "xx ")[0]

        对应脚本document.getElementByIdx_x( "xx ")

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