input框focusEnd

$.fn.setCursorPosition = function(position){   if(this.lengh == 0) return this;   return $(this).setSelection(position, position);}$.fn.setSelection = function(selectionStart, selectionEnd) {   if(this.lengh == 0) return this;   input = this[0];   if (input.createTextRange) {      var range = input.createTextRange();      range.collapse(true);      range.moveEnd('character', selectionEnd);      range.moveStart('character', selectionStart);      range.select();   } else if (input.setSelectionRange) {      input.focus();      input.setSelectionRange(selectionStart, selectionEnd);   }   return this;}$.fn.focusEnd = function(){   this.setCursorPosition(this.val().length);}$("###").focusEnd();