原生监听键盘事件

通过按特定键盘指令，来切换不同的页面
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
<style>
    .changepages-index{
        width: 100%;
        height: 100%;
        display: flex;
        flex-direction: column;
    }
    header{
        height: 60px;
        width: 100%;
        text-align: center;
        line-height: 60px;
        font-size: 20px;
    }
    #myrame{
        width: 100%;
        flex: 1;
    }
</style>
    <div class="changepages-index">
        <header>这是头部</header>
  </div>
</body>
<script>
    var  menuList = [
                        {name:'A页面',url:'http://A'},
                        {name:'B页面',url:'http://B'},
                        {name:'C页面',url:'http://C'},
                        {name:'D页面',url:'http://D'},
                    ];
    var key = 0;
    var fatherTag = document.getElementsByClassName('changepages-index')[0]
    var iframeTag = document.createElement('iframe')
    iframeTag.src = menuList[key].url
    iframeTag.id = 'myrame'
    fatherTag.append(iframeTag)
    document.onkeydown = function(e){
        let e1 = e || event || window.event || arguments.callee.caller.arguments[0]
        if(e1 && e1.keyCode){
            switch(e1.keyCode){
                case 49:
                key = 0;//1
                break;
                case 50:
                key = 1;//2
                break;
                case 51:
                key = 2;//3
                break;
                case 52:
                key = 3;//4
                break;
                case 37:
                case 38:
                key === 0 ? key = 3 : key--//右、下
                break;
                case 39:
                case 40:
                key === 3 ? key = 0 : key++//左、上
                break;
            }
        }
        iframeTag.src = menuList[key].url
    }
</script>
</html>
keyCode的对照表
原生监听键盘事件

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