js禁止网页缩放

<script>
    //pc禁止网页缩放，支持chrome,ff
    var zoom=function(e){
        var e = e || window.event;
        if(e.wheelDelta && event.ctrlKey){
            event.returnValue = false
        }else if ( e && e.preventDefault ){
            e.preventDefault();
        }if(e.detail){
            event.returnValue = false;
        }
    }
    if(document.addEventListener){
        document.addEventListener('DOMMouseScroll' , zoom , false);
    }
    window.onmousewheel = document.onmousewheel = zoom;

</script>