var JPlaceHolder = {
    //检测
    _check: function () {
        return 'placeholder' in document.createElement('input');
    },
    //初始化
    init: function () {
        if (!this._check()) {
            this.fix();
        }
    },
    //修复
    fix: function () {        
        jQuery(':input[placeholder]').each(function (index, element) {
            var self = $(this), txt = self.attr('placeholder'), atrValue = self.attr('type');

            //密码文本框
            if (atrValue == "password") {
                self.attr("type", "text");
                self.attr("pwd", "true");
            } else {
                self.attr("pwd", "false");
            }

            self.focusin(function (e) {
                var atrpwd = self.attr('pwd');
                if (atrpwd == "true") {
                    self.attr("type", "password");
                } else {
                    self.attr("type", "text");
                }
                self.val("");
            }).focusout(function (e) {
                if (!self.val()) {
                    self.attr("type", "text");
                    self.val(txt);
                }
            });
            if (self.val().length > 0) {
                self.val("");
            }
            else {
                self.val(txt);

            }

        });
    }
};
//执行
jQuery(function () {
    JPlaceHolder.init();
});