问检查javascript中的内容css

EN

var push = document.querySelector('.push-button');
var result = getComputedStyle(push).content;
if ($('.push-button').css('content') == "mobile") {
 $(document).ready(function () {
    $('.main').css("color", "black");

});
} else if (result ===  "desktop") {
 $(document).ready(function () {
    $(".push-button").click(function () {
        $('.desktop-menu').slideToggle(1000);
        $('.desktop-menu').css('display', 'block');
    });
});
}