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<!DOCTYPE html>
<html>
<body>
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<h1>HTML DOM Attributes</h1>
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<h2>getNamedItem() 方法</h2>
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<button id ="myButton" onclick="myFunction()">按钮</button>
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<p>按钮的 onclick 属性的值是：</p>
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<p id="demo"></p>
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<script>
const nodeMap = document.getElementById("myButton").attributes;
let value = nodeMap.getNamedItem("onclick").value;  
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document.getElementById("demo").innerHTML = value;
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function myFunction() {}
</script>
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</body>
</html>
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