48 lines
686 B
HTML
48 lines
686 B
HTML
<!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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//number
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// var age=20;
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// var price=99.8;
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// alert(typeof age);
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// alert(typeof price);
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//string
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// var ch='a';
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// var name ='张三';
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// var addr = "北京";
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// alert(typeof ch);
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// alert(typeof name);
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// alert(typeof addr);
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//boolean
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// var flag1=true;
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// var flag2=false;
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//
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// alert(typeof flag1);
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// alert(typeof flag2);
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//null
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// var obj=null;
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// alert(typeof obj); //object
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//undefined
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var a;
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alert(typeof a); //undefined
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</script>
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</body>
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</html> |