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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>
- let obj = {
- a:1,
- b:2
- }
- let sym = Symbol();
- // console.log(sym)
- obj[sym] = "hello";
- // console.log(obj)
- // console.log(obj[sym]);
- for(let k in obj){
- console.log(k)
- }
- console.log(Object.keys(obj))
- </script>
- </body>
- </html>
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