document.write将不会在网页上显示文本 [英] document.write won't show the text on the web page

问题描述

当我运行这个简单的greasemonkey脚本

When I run this simple greasemonkey script

alert("hello");
alert(document.location);
document.write("hello");
alert("hello");

仅前两个语句起作用，第三和第四条语句不起作用.

Only the first two statements work, the third and fourth statement do nothing.

这可能是什么问题?

推荐答案

document.write()似乎只能从Greasemonkey间歇地工作-可能是由于沙箱造成的.

It seems that document.write() only works intermittently from Greasemonkey -- maybe due to the sandbox.

我还没有找到万无一失的方法来重复该问题.

I haven't found a foolproof recipe for duplicating the issue yet.

但是，基于DOM的方法似乎总是可行.使用此代码:

However, the DOM-based approach always seems to work. Use this code:

//--- Erase everything from the page's body:
var b           = document.body;
var p           = b.parentNode;
p.removeChild (b);


//--- Add our new text or HTML.
var newB        = document.createElement ("BODY");
newB.innerHTML  = "Hello";
p.appendChild (newB);

PS:我也更新了其他答案.

PS: I updated my other answer as well.

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