如果在javascript中有值，则禁用数组

Question

我正在尝试用javascript开发一个简单的横幅旋转。

如何确保只有值为"active"：1的数组包含在shuffle中？

<div id="ad-container"></div>
<script>
var banner = [{
        "img": "https://DOMAIN.TLD/IMG.JPG",
        "url": "https://LINK.DOMAIN.TLD",
        "maxWidth": 468,
        "active": 1
      },
      {
        "img": "https://DOMAIN.TLD/IMG2.JPG",
        "url": "https://LINK2.DOMAIN.TLD",
        "maxWidth": 468,
        "active": 0
      }
,
      {
        "img": "https://DOMAIN.TLD/IMG3.JPG",
        "url": "https://LINK3.DOMAIN.TLD",
        "maxWidth": 468,
        "active": 1
      }
    ];
function shuffle(banners) {
      var j, x, i;
      for (i = banners.length - 1; i > 0; i--) {
        j = Math.floor(Math.random() * (i + 1));
        x = banners[i];
        banners[i] = banners[j];
        banners[j] = x;
      }
      return banners;
    }
    shuffle(banner);
document.getElementById('ad-container').innerHTML = '<a href="' + banner[0]["url"] + '"><img src="' + banner[0]["img"] + '" style="width: 100%;height: auto;max-width: ' + banner[0]["maxWidth"] + 'px;"></a>';
</script>

值为"active"的所有数组：0不应包含在shuffle中。

也许有人知道如何改进shuffle/代码，或者如果同一页面上包含更多document.getElementById，如何防止同一横幅在页面上多次显示。

提前谢谢。

Answer 1

只需过滤数组。

var banner = [{
        "img": "https://DOMAIN.TLD/IMG.JPG",
        "url": "https://LINK.DOMAIN.TLD",
        "maxWidth": 468,
        "active": 1
      },
      {
        "img": "https://DOMAIN.TLD/IMG2.JPG",
        "url": "https://LINK2.DOMAIN.TLD",
        "maxWidth": 468,
        "active": 0
      }
,
      {
        "img": "https://DOMAIN.TLD/IMG3.JPG",
        "url": "https://LINK3.DOMAIN.TLD",
        "maxWidth": 468,
        "active": 1
      }
    ];
    
    let activeParts = banner.filter( info => info.active );
    
    console.log( activeParts ); 
    // do whatever, e.g.:
    // shuffle( activeParts );