Jquery 当屏距缩小或扩大对元素进行隐藏显示

//定时器 每0.1秒执行一次    
setInterval(function(){
        var wd=$(window).width();
        var g=$(\'#guanliyuan\');
        var p=$(\'#people\');
           //当屏距小于680时对元素占位隐藏
        if(wd<680){
            g.css(\'visibility\',\'hidden\');
            p.css(\'visibility\',\'hidden\');
        }
           //当屏距小于680时对元素进行显示        
        if(wd>=680){
            g.css(\'visibility\',\'visible\');
            p.css(\'visibility\',\'visible\');
        }
    },100)