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<!DOCTYPE html>
<html>
<body>
<h1>JavaScript 数组</h1>
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<h2>findLastIndex() 方法</h2>
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<p id="demo"></p>
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<script>
const temp = [27, 28, 30, 40, 42, 35, 30];
let pos = temp.findLastIndex(x => x > 40);
​
document.getElementById("demo").innerHTML = "最后一个超过 40 度的温度位于位置 " + pos;
</script>
​
</body>
</html>
​