如何使用Javascript和JQuery自动选择文本(点击并按住鼠标)？

// 使用Javascript自动选择文本
function selectText(element) {
  var doc = document;
  var text = doc.getElementById(element);

  if (doc.body.createTextRange) { // For IE
    var range = doc.body.createTextRange();
    range.moveToElementText(text);
    range.select();
  } else if (window.getSelection) { // For modern browsers
    var selection = window.getSelection();
    var range = doc.createRange();
    range.selectNodeContents(text);
    selection.removeAllRanges();
    selection.addRange(range);
  }
}

// 使用JQuery自动选择文本
function selectText(element) {
  var text = $("#" + element)[0];

  if (document.body.createTextRange) { // For IE
    var range = document.body.createTextRange();
    range.moveToElementText(text);
    range.select();
  } else if (window.getSelection) { // For modern browsers
    var selection = window.getSelection();
    var range = document.createRange();
    range.selectNodeContents(text);
    selection.removeAllRanges();
    selection.addRange(range);
  }
}

// 调用函数来自动选择文本
selectText("myTextElement");