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<html lang="en"><head><meta charset="UTF-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><title>变量的使用</title>
</head><body><script>//声明一个年龄变量let age// 赋值age = 17console.log(age)// 声明的时候直接赋值let age1 = 19// 小案例(规范代码)let num = 20let uname = 'pink'console.log(num)console.log(uname)</script>
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