jQuery自定义组件——输入框设置默认提示文字

if (window.jQuery || window.Zepto) {
    
    /**
     * 设置输入框提示信息
     * @param options
     * @author rubekid
     */
    var setInputTipValue = window.setInputTipValue = function(target, options){
        options = options ||{};
        var _self = target.get(0);
        if(_self._initTip){
            return false;
        }
        target.show();
        var color = options.color||"#999999";
        var inputPrompt = target.clone();
        var name =  target.attr("name");
        var tipText = options.tipText || target.attr("data-tip") ||"";
        inputPrompt.val(tipText);
        inputPrompt.attr("type", "text");
        inputPrompt.removeAttr("id");
        inputPrompt.removeAttr("name");
        inputPrompt.removeAttr("maxlength");
        inputPrompt.removeAttr("data-tip");
        inputPrompt.attr("class", target.attr("class"));
        inputPrompt.attr("readonly", true);
        inputPrompt.css({"color":color});
        _self._initTip = true;//设置标示，防止重复绑定
        
        var _event = "focus";
        if(‘ontouchstart‘ in window){ //手机浏览器聚焦无法弹出键盘处理
            inputPrompt.attr("disabled", "disabled");
            _event = "touchstart"; 
        }
        
        var init = function(){
            if($.trim(target.val())==""){
                target.val("");
                target.after(inputPrompt);
                target.hide();
                inputPrompt.show();
                inputPrompt.bind(_event,function(){
                    setTimeout(function(){
                        target.focus();
                    });
                });
            }
        };
        target.bind({
            blur: function(){
                init();
            },
            focus:function(){
                inputPrompt.detach();
                $(this).show();
            },
            _reset:function(){ 
                if($.trim(target.val())==""){
                    init();
                }
                else{
                    target.show();
                    if(inputPrompt){
                        inputPrompt.hide();
                        inputPrompt.remove();
                    }
                }
            }
        });
        init();
    };
    
    /**
     * jQuery 自定义插件
     */
    (function ($) {
        ‘use strict‘;
        /**
         * 设置输入灰色提示值
         * @author rubekid
         */
        $.fn.setInputTip = function(options){
            return this.each(function(){
                var settings = $.extend({}, options||{});
                setInputTipValue($(this), settings);
            });
        };
        
    })(window.jQuery || window.Zepto);
}

<input type="text" data-tip="请输入要名称进行查询" id="keyword" name="keyword" />
<script type="text/javascript">
$(function(){
    $("#keyword").setInputTip();
});    
</script>