​x
 
<!DOCTYPE html>
<html>
<body>
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<h1>HTML DOM 属性</h1>
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<h2>length 属性</h2>
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<button id="myButton" onclick="myFunction()">试一试</button>
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<p>按钮的第二个属性 (index 1) 是：</p>
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<p id="demo"></p>
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<script>
let attr = document.getElementById("myButton").attributes[1].name;
document.getElementById("demo").innerHTML = attr;
​
function myFunction() {}
</script>
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</body>
</html>
​