placeholder插件及placeholder默认颜色修改

 $.fn.placeHolder = function(){
     $(this).each(function(i, el) {
         var self = $(el);
         if ($.browser.msie && !("placeholder" in $("<input/>")[0])) {
             if(self.attr("data-placeHolder")||!self.attr("placeholder")){
                 return;
             }
             self.attr("data-placeHolder",true);
             var that = $("<div/>");
             var parent = self.parent();
             if(parent.css("position")!=="absolute"&&parent.css("position")!=="fixed"){
                 parent.css("position", "relative");
             }
             that.css({
                 "left": self.offset().left - parent.offset().left + parseInt(self.css("borderLeftWidth")),
                 "top": self.offset().top - parent.offset().top + parseInt(self.css("borderTopWidth")),
                 "width":self.width(),
                 "height":self.height(),
                 "lineHeight":self.css("lineHeight"),
                 "fontSize":self.css("fontSize"),
                 "paddingLeft":self.css("paddingLeft"),
                 "paddingTop":self.css("paddingTop"),
                 "textIndent":self.css("textIndent"),
                 "position":"absolute",
                 "color":"#666669",
                 "outline":"none!important",
                 "border":"none!important",
                 "backgroundColor":"transparent",
                 "cursor": "text"
             });
             that.html(self.attr("placeholder"));
             parent.append(that);
             that.on("click", function() {
                 self[0].focus();
             });
             function showPlaceholder() {
                 if (self.val() === "") {
                     that.show()
                 } else {
                     that.hide();
                 }
             }
             self.on("input propertychange", showPlaceholder);
             showPlaceholder();
         }
     });
 };

 $(function() {
     $("[placeholder]").placeHolder();
 });

改变placeholder的默认颜色代码如下：

::-moz-placeholder{color:red;}                   //ff
::-webkit-input-placeholder{color:red;}     //chrome,safari
:-ms-input-placeholder{color:red;}             //ie10

Placeholder插件在支持自带placeholder的浏览器原样显示不处理，低版本在同级创建div。（记得引入jQuery）