lovecoding
/
W260426


			
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							<!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>
    <script>
        // 变量类型

        // 基本数据类型(值类型)
        // 数值型、字符串型、布尔型、空型null、未定义型undefined

        // 引用数据类型
        // 数组、对象


        // var a = 10;
        // var b = a;
        // a = 20;
        // console.log(b);


        var arr1 = [1,2,3];

        // var arr2 = [];
        // arr2[0] = arr1[0];
        // arr2[1] = arr1[1];
        // arr2[2] = arr1[2];
        var arr2 = arr1;
        arr1.push(4);
        console.log(arr2)


    </script>
</body>
</html>