将鼠标焦点定位到文本框最后

//设置焦点相关---begin
//用法：$("#txtInput").val("你好").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 () {
if (this.val() != undefined) {
this.setCursorPosition(this.val().length);
}
}
//设置焦点相关---end