js添加水印文字



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function watermark(id,value) {    var obj =  document.getElementById(id);    obj.value = value;    obj.style.cssText = "color:#ccc";    //獲取焦點事件    obj.onfocus = function()    {        this.style.cssText = "color:#333";        if(this.value==value)        {            this.value = '';          }    };    //失去焦點事件    obj.onblur = function()    {        if(this.value=="")        {          this.value = value;          this.style.cssText = "color:#ccc";        }        else        {          this.style.cssText = "color:#333";        }    }; }