IE9以下 placeholder兼容

//input placeholder兼容
!(function ($, doc, win) {
    $.fn.placeholder = function () {
        var i = doc.createElement('input'),
            placeholdersupport = 'placeholder' in i;
        if (!placeholdersupport) {
            var inputs = $(this);
            inputs.each(function () {
                var input = $(this),
                    text = input.attr('placeholder'),
                    pdl = 0,
                    height = input.outerHeight(),
                    width = input.outerWidth(),
                    placeholder = $('<span class="phTips_tadllj">' + text + '</span>');
                try {
                    pdl = input.css('padding-left').match(/\d*/i)[0] * 1;
                } catch (e) {
                    pdl = 5;
                }
                placeholder.css({ 'margin-left': -(width - pdl), 'height': height, 'line-height': height + "px", 'position': 'absolute', 'color': "#999", 'font-size': "14px", "z-index": "100" });
                placeholder.click(function () {
                    //placeholder.css({display:'none'});
                    input.focus();
                });
                if ($.trim(input.val()).length > 0) {
                    placeholder.css({ display: 'none' });
                } else {
                    placeholder.css({ display: 'inline' });
                }
                placeholder.insertAfter(input);
                input.on("focus", function (e) {
                    placeholder.css({ display: 'none' });
                }).on("blur", function (e) {
                    var _this = $(this);
                    if ($.trim(_this.val()).length > 0) {
                        placeholder.css({ display: 'none' });
                    }
                    else {
                        placeholder.css({ display: 'inline' });
                    }
                });
                // .keyup(function(e){
                //     if($(this).val() != ""){
                //         placeholder.css({display:'none'});
                //     }else{
                //         placeholder.css({display:'inline'});
                //     }
                // })
            });
        }
        return this;
    };
    var isIe = false;
    if (navigator.userAgent.indexOf("MSIE") > 0) {
        if (!$.support.leadingWhitespace || navigator.userAgent.indexOf("MSIE 9.0") > 0) {//IE9以下不让登陆
            isIe = true;
        }
    }
    if (isIe) {
        $('input[placeholder]').placeholder();
    }
})(jQuery, document, window);