Greasemonkey (JavaScript) 文本区域问题
我编写了一个基本的 Greasemonkey 脚本，它将输出传递到 textarea，如下所示：
var obj = document.getElementById("comment").innerHTML = "\n" + "Note:" + "\n" + "\n" + output_string;
它的工作原理就像一个魅力，如果您更改源中的值，它将更新文本区域。但是，一旦您自己在文本区域内写入任何内容并选择一个值，它就不会覆盖您在文本区域内写入的内容。并且您需要完全刷新页面才能再次使用该功能。这是为什么？
I have written a basic Greasemonkey script which passes an output out to a textarea, like this:
var obj = document.getElementById("comment").innerHTML = "\n" + "Note:" + "\n" + "\n" + output_string;
It works like a charm, if you change the value from the source, it will update the textarea. However, as soon as you write anything yourself inside the textarea and select a value, it will not overwrite what you written inside the textarea. And you need to refresh the page entirely to be able to use the function again. Why is that?
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当您在其中输入内容时，
textarea的value属性就会被设置。这会覆盖任何innerHTML值。您应该使用
value属性来设置输入元素（如textarea）的内容。试试这个：
The
textarea'svalueattribute is set as soon as you type something into it. This overrides anyinnerHTMLvalue.You should be using the
valueattribute to set the contents of input elements liketextarea.Try this instead:
如果您需要文本区域始终显示相同的文本，我建议您使用自定义的greasemonkey 脚本在其上附加模糊事件。模糊事件将执行与现在相同的操作。唯一的变化是，当光标从
textarea上聚焦时，textarea将被更新。如果这就是你想要的，因为我不太清楚你想做什么。
If you need your text area to always display the same text I suggest you attach blur event on it using your customized greasemonkey script. Blur event would do the same thing as it does now. The only change would be that
textareawill be updated the moment cursor focuses off thetextarea.If that's what you were after, 'cause I didn't understand it quite clearly what are you trying to do.