1 /**
  2  * 表单中的默认字符,点击后隐藏这些字符
  3  * @constructor
  4  * @author putaoshu@126.com
  5  * @param {Object} obj 主对象
  6  * @date 2012-02-08
  7  * @example <input type="text" defaultchars="搜索大家共享的文件">
  8  */
  9 
 10 vui.defaultchars = function(obj){
 11 	var $this = $(obj);
 12 	if($this.val()) return;
 13 	var $defaultchars = $this.attr('defaultchars');
 14 	$this.val($defaultchars);
 15 	$this.focusin(function(){
 16 		if ($this.val() == $defaultchars) $this.val('');
 17 	}).focusout(function(){
 18 		if ($this.val() == '') $this.val($defaultchars);
 19 	});
 20 }