利用js在文本框末尾获得焦点

function moveEnd(obj) {
	obj.focus();
	var len = obj.value.length;
	if (document.selection) {
		var sel = obj.createTextRange();
		sel.moveStart('character', len);
		sel.collapse();
		sel.select();
	} else if (typeof obj.selectionStart == 'number'
			&& typeof obj.selectionEnd == 'number') {
		obj.selectionStart = obj.selectionEnd = len;
	}
}