javascript MouseWheel事件&视频音量-防止页面滚动 [英] javascript MouseWheel event & video volume - prevent page scroll

问题描述

我正在尝试使用MouseWheel控制视频音量，
我想在鼠标悬停在视频上时完全禁用页面滚动，
它可以正常工作，但是当视频的音量达到最小值和最小值时会出现问题.最高水平:
页面滚动开始...如果鼠标悬停在视频上，我不希望页面滚动！
实际上，我正在使用chrome浏览器:

I'm trying to control a video volume using the MouseWheel,
I want to completely disable the page scroll when my mouse is over the video,
it works but there's a problem when the video's volume reaches the min & max levels:
the page scroll begins...and I don't want the page scroll if my mouse is over the video!
Actually I'm trying it in chrome:

var popo = document.getElementById('popo');
var coco = document.getElementById('coco');
//popo.play();

//setTimeout(function(){
//    popo.pause();
//},3000);

var current = 0;
var doScroll = function (e) {
    // cross-browser wheel delta
    e = window.event || e;
    var delta = Math.max(-1, Math.min(1, (e.wheelDelta || -e.detail)));

    // Do something with `delta`
    current = current + delta;
    coco.innerHTML = current;

    if(delta== 1){popo.volume+=0.1;}
    if(delta== -1){popo.volume-=0.1;}

    e.preventDefault();
};

if (popo.addEventListener) {
   popo.addEventListener("mousewheel", doScroll, false);
    popo.addEventListener("DOMMouseScroll", doScroll, false);
} else {
    popo.attachEvent("onmousewheel", doScroll);
}

JSFiddle演示: http://jsfiddle.net/NSjqd/5/

JSFiddle DEMO: http://jsfiddle.net/NSjqd/5/

推荐答案

您将希望向if语句中添加条件以将其打开或关闭，如下所示:

You will want to add a condition to your if statement to turn it up or down like so:

if(delta== 1 && popo.volume <= 0.9){popo.volume+=0.1;}
if(delta== -1 && popo.volume > 0.1){popo.volume-=0.1;}

演示

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