JavaScript伪协议实际上做了什么？ [英] What does the JavaScript pseudo protocol actually do?
问题描述
换句话说，
onclick="myFunction()"
和
onclick="JavaScript:myFunction()"
推荐答案
JavaScript： TYPE / LABEL / PREFIX（找不到它的实际名称）在事件处理程序中只提供一个目的：
The JavaScript: TYPE/LABEL/PREFIX (could not find the actual name for it) in the event handler serves one purpose only:
在IE浏览器中， IFF 页面上的第一个脚本是不 JavaScript，页面其余部分的内联JavaScript已经（仍然有？） code> javascript：为它添加前缀。
In IE, IFF the FIRST script on the page is NOT JavaScript, inline JavaScript on the rest of the page had (still has?) to have javascript: prefixing it.
不要将其与href中的 javascript： 协议混淆（顺便也应该避免）。只有在AREA标记中的旧网景中才需要 href =javascript：...。当你看到 href =javascript：void（0）有人需要使用 onclick =....; return false相反，除非他们把它放在那里提醒用户该链接是一个javascript驱动的链接。如果关闭JS，它将失败。
It is not to be confused with the javascript: protocol in the href (which by the way also should be avoided). href="javascript:..." is only ever needed in old netscapes in the AREA tag. When you see the href="javascript:void(0)" someone needs to use onclick="....; return false" instead unless they put it there to alert the user that the link is a javascript driven one. It will fail if JS is turned off.
我查找了msdn的官方文档，但这里有讨论支持我：
I looked for the official documentation from msdn, but here are discussions to back me up:
Internet Explorer默认使用它解析的第一个脚本元素
的语言。因此，如果第一个脚本元素是javascript，则不应该在
中在事件处理程序中指定javascript：。
Internet Explorer defaults to the language of the first script element it parses. So if the first script element is javascript, you shouldn't need to specify "javascript:" in your event handler.
http://www.webdeveloper.com/forum/archive /index.php/t-135462.html
你必须告诉IE你正在使用VBS和JScript，否则
假设在这个实例中所有函数都是VBS。要么在页面顶部添加
（空？）JavaScript脚本元素，要么在
onchange上使用jscript：protocol。
onchange =jscript：location.hash = this [this.selectedIndex] .value;
You have to tell IE you are using VBS AND JScript, otherwise the assumption is all functions are VBS in this instance. Either add a (empty?) JavaScript script element [at the top of your page] or use the jscript: protocol on the onchange. onchange="jscript:location.hash=this[this.selectedIndex].value;"
示例
<html>
<head>
<script language="VBScript">
' some vbscript here forces the default language
' of the page to be VBScript and not jScript/JavaScript
</script>
</head>
<body onload="javascript:alert('I am inline in an event handler - boo me')">
.
.
<a href="..." onclick="javascript:alert('and so am I'); return false">Click</a>
.
<a href="javascript:alert('javascript: PROTOCOL is NOT the same (but avoid it too)')">
Click
</a>
</body>
</html>
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