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<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="UTF-8">
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<title>04-变量</title>
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</head>
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<body>
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<script>
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// var test=20;
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//
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// test="张三";
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// alert(test);
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/**
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* var特点:
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* 1.作用域:全局变量
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* 2.变量可以重复定义
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*/
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{
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let age=30
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}
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alert(age);
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</script>
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</body>
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</html> |