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>Execution Context Example 1</title>
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    <script type="text/javascript">
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        var color = "blue";
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        function changeColor(){
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            if (color === "blue"){
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                color = "red";
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            } else {
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                color = "blue";
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            }
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        }
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        changeColor();
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​
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        alert("Color is now " + color);
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    </script>
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​
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</head>
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<body>
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</body>
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</html>