1. <body>
    2.     <img src="./images/工作阶段bg.png" alt="" onmousewheel="bbimg(this)">
    3. </body>
    4. <script>
    5.     function bbimg(o){
    6.       var zoom = parseInt(o.style.zoom,10)||100;
    7.       zoom += event.wheelDelta/12;
    8.       if(zoom>0) o.style.zoom = zoom+'%';
    9.           return false      
    10.     }
    11. </script>