1. 对象转换为字符串

    JSON.stringify()

  2. 字符串转换为对象

    JSON.parse()

  3. 举例：

    <!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<canvas id="canvas"></canvas>
<script>
    let a = [1,2,3];
    let a1 = JSON.stringify(a);
    let a2 = JSON.parse(a1);
    let b = {'name':'a','age':18};
    let b1 = JSON.stringify(b);
    let b2 = JSON.parse(b1);
    console.log(a1);
    console.log(a2);
    console.log(b1);
    console.log(b2);
</script>
</body>
</html>

    JavaScript：对象转换为字符串、字符串转换为对象_html