HTML&CSS/test.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <style>
        *{padding: 0;margin: 0;}
        #sec{
            background-color: #f00;
        }
        .left {
            float: left;
            width: 100px;
            height: 100px;
            background-color: yellow;
        }
        .right{
            height: 110px;
            background-color: #ccc;
            overflow: auto;
        }
        
    </style>
</head>
<body>
    <section id="sec">
        <div class="left">left</div>
        <div class="right">right</div>
    </section>
</body>
<script>
var array1 = [12 , "foo" , {name:"Joe"} , -2458];
var array2 = ["Doe" , 555 , 100];
Array.prototype.push.apply(array1, array2);
//array1 值为 [12 , "foo" , {name "Joe"} , -2458 , "Doe" , 555 , 100] 
</script>
</html>