使用jquery从输入框移动光标

$(document).ready(function(){
  $("#input").focus();
});

$(document).ready(function(){
  $("#input").focus();
  var range = document.createRange();
  range.selectNodeContents($("#input")[0]);
  var selection = window.getSelection();
  selection.removeAllRanges();
  selection.addRange(range);
});

$(document).ready(function(){
  $("#input").focus();
  var range = document.createRange();
  range.selectNodeContents($("#input")[0]);
  var selection = window.getSelection();
  selection.removeAllRanges();
  selection.addRange(range);
  var cursorPos = $("#input").prop("selectionStart");
  var text = $("#input").val();
  var textBeforeCursor = text.substring(0, cursorPos);
  var textAfterCursor = text.substring(cursorPos);
  var newText = textBeforeCursor + "\b" + textAfterCursor;
  $("#input").val(newText);
});