在光标位置插入内容

最新推荐文章于 2025-03-20 10:28:44 发布

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最新推荐文章于 2025-03-20 10:28:44 发布

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文章标签： new一个对象的过程发生了什么 JS中this的设计缺陷 this设计缺陷的应对方案

本文链接：https://blog.youkuaiyun.com/qq_42872073/article/details/123874131

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const insertAtCursor =(myField, myValue) => {
// myField：输入框元素, myValue: 要插入的值
    if (document.selection) {
      // IE support
      myField.focus()
      const sel = document.selection.createRange()
      sel.text = myValue
      sel.select()
    } else if (myField.selectionStart || myField.selectionStart === '0') {
      // MOZILLA/NETSCAPE support
      let startPos = myField.selectionStart
      let endPos = myField.selectionEnd
      let beforeValue = myField.value.substring(0, startPos)
      let afterValue = myField.value.substring(endPos, myField.value.length)

      myField.value = beforeValue + myValue + afterValue

      myField.selectionStart = startPos + myValue.length
      myField.selectionEnd = startPos + myValue.length
      myField.focus()
    } else {
      myField.value += myValue
      myField.focus()
    }
  }