//判断是手机端还是pc端
        function isPc(){
            if(window.navigator.userAgent.match(/(phone|pad|pod|iPhone|iPod|ios|iPad|Android|Mobile|BlackBerry|IEMobile|MQQBrowser|JUC|Fennec|wOSBrowser|BrowserNG|WebOS|Symbian|Windows Phone)/i)) {
              return true; // 移动端
            }else{
              return false; // PC端
            }
        }