問題：
Does anybody know how to move the keyboard caret in a textbox to a particular position?有人知道如何將文本框中的鍵盤插入符號移動到特定位置嗎？
For example, if a text-box (eg input element, not text-area) has 50 characters in it and I want to position the caret before character 20, how would I go about it?例如，如果一個文本框（例如輸入元素，而不是文本區域）中有 50 個字符，而我想將插入符號放在字符 20 之前，我將如何處理？
This is in differentiation from this question: jQuery Set Cursor Position in Text Area , which requires jQuery.這與這個問題不同： jQuery Set Cursor Position in Text Area ，這需要 jQuery。
解決方案：
參考一： https://en.stackoom.com/question/29Ka參考二： https://stackoom.com/question/29Ka