JavaScript代码内部< script>标签 [英] JavaScript Code Inside <script> Tag

问题描述

显然，JSON对象可以在链接脚本中传递。我正在试图弄清楚它是如何工作的（或者如果它有效）：

Apparently a JSON object can be passed inside a linked script. I'm trying to figure out exactly how this works (or if it does):

<script type="text/javascript" src="https://getfirebug.com/firebug-lite.js">
{
    overrideConsole: false,
    startInNewWindow: true,
    startOpened: true,
    enableTrace: true
}
</script>

我在firebug lite文档中注意到它：
http://getfirebug.com/firebuglite#ScriptJSONOptions

I noticed it here in the firebug lite documentation: http://getfirebug.com/firebuglite#ScriptJSONOptions

推荐答案

由于元素具有 src 属性，因此不会执行内容。它不是严格合法的。 HTML5规范说：

The content is not executed because the element has a src attribute. It's not strictly legal as is. The HTML5 spec says:

如果有 src 属性，则元素必须为要么为空，要么只包含也符合脚本内容限制的脚本文档。

If there is a src attribute, the element must be either empty or contain only script documentation that also matches script content restrictions.

< script>的内容; 元素既不是有效的JSON也不是有效的JavaScript。它不是有效的JSON，因为未引用属性名称。它不是有效的JavaScript，因为虽然它看起来像带有标记语句的块表达式，但 startInNewWindow 之后的冒号不能合法地出现在那里。

The content of that <script> element is neither valid JSON nor valid JavaScript. It is not valid JSON because the property names are not quoted. It is not valid JavaScript because, although it looks like a block expression with labeled statements, the colon after startInNewWindow cannot legally appear there.

也就是说，加载的脚本总是可以查找最后一个脚本元素并解析其内容：

That said, the script that is loaded can always look for the last script element and parse its content:

 var scripts = document.getElementsByTagName('SCRIPT');
 var lastScript = scripts[script.length - 1];
 var content = eval(lastScript.innerText || lastScript.textContent);

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