jQuery在文本区域中设置光标位置

我有两个功能：

function setSelectionRange(input, selectionStart, selectionEnd) {  if (input.setSelectionRange) {    input.focus();    input.setSelectionRange(selectionStart, selectionEnd);  }  else if (input.createTextRange) {    var range = input.createTextRange();    range.collapse(true);    range.moveEnd('character', selectionEnd);    range.moveStart('character', selectionStart);    range.select();  }}function setCaretToPos (input, pos) {  setSelectionRange(input, pos, pos);}

然后，您可以像这样使用setCaretToPos：

setCaretToPos(document.getElementById("YOURINPUT"), 4);

带有a

textarea

input

function setSelectionRange(input, selectionStart, selectionEnd) {  if (input.setSelectionRange) {    input.focus();    input.setSelectionRange(selectionStart, selectionEnd);  } else if (input.createTextRange) {    var range = input.createTextRange();    range.collapse(true);    range.moveEnd('character', selectionEnd);    range.moveStart('character', selectionStart);    range.select();  }}function setCaretToPos(input, pos) {  setSelectionRange(input, pos, pos);}$("#set-textarea").click(function() {  setCaretToPos($("#the-textarea")[0], 10)});$("#set-input").click(function() {  setCaretToPos($("#the-input")[0], 10);});<textarea id="the-textarea" cols="40" rows="4">Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.</textarea><br><input type="button" id="set-textarea" value="Set in textarea"><br><input id="the-input" type="text" size="40" value="Lorem ipsum dolor sit amet, consectetur adipiscing elit"><br><input type="button" id="set-input" value="Set in input"><script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>

截至2016年，测试并在Chrome，火狐，IE11，甚至IE8的工作（见去年在这里
;栈片断不支持IE8）。