实例代码“Ctrl+/”提示“F11/ESC”全屏 返回 格式化 恢复 运行
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<!DOCTYPE html>
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<html>
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    <head>
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        <title>
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            Increment/Decrement Example 2
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        </title>
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        <script type="text/javascript">
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            var num1 = 2;
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            var num2 = 20;
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            var num3 = --num1 + num2; //equals 21
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            var num4 = num1 + num2; //equals 21
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            alert(num3);
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            alert(num4);
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        </script>
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    </head>
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    <body>
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    </body>
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</html>