A quick function to replace the selected text (in Firefox). Accepts:

替换所选文本的快速功能(在Firefox中)。 接受：

• string to replace the selection, or
  字符串来替换选择，或者
• callback function that takes the selected text and returns a string to replace the selection
  带有所选文本并返回字符串以替换所选内容的回调函数

function replaceSelection(t) {
  if (typeof t === 'function') {
    t = t(window.getSelection().toString());
  }
  var range = window.getSelection().getRangeAt(0);
  range.deleteContents();
  range.insertNode(document.createTextNode(t));
}

Usage:

用法：

1. Replace selected text with "dude" replaceSelection('dude'); 2. Uppercase the selected text replaceSelection(function(s){return s.toUpperCase()}); 3. Lowercase the selected text replaceSelection(function(s){return s.toLowerCase()});

1.将所选文本替换为“ dude” replaceSelection('dude'); 2.大写所选文本replaceSelection(function(s){return s.toUpperCase()}); 3.小写所选文本replaceSelection(function(s){return s.toLowerCase()});

Luckily I'm so close (and yet so far) to finishing this book, otherwise I won't be able to help myself but create a whole toolbar of bookmarklets for "power" Google doc users...

幸运的是，我已经很接近(到目前为止)完成本书，否则我将无法为自己服务，而是为“强大”的Google文档用户创建了一个完整的书签小工具栏...

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翻译自: https://www.phpied.com/replace-selected-text-firefox/