如何使用浏览器的地址栏更改网站背景颜色？

Question

When I type in the address bar in Google Chrome or any other browser:

javascript:alert("hello");​​​​​

It works, but

javascript:document.body.style.background="Red";

doesn't. Why is that? How to use the address bar to change the background color?

Answer 1

Add ;void 0 after the bookmarklet. When the code has a non- undefine value, the page unloads, and the return value is printed.

A common way to write bookmarklets is:

javascript:(function(){ ... code ... })();

• The anonymous function returns undefined , so the page will not unload.
• The closure enables local variables, so that no conflicts can occur with existing global properties.

Note that in the latest versions of modern browsers (FF, Chrome), many objects are not available through the javascript: -URL in the location bar .

Answer 2

You need to activate this ability in your Chrome configuration. It's turned off by default.

Answer 3

之所以使用XMLForDummies，是因为无法从该位置访问文档对象。