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<!DOCTYPE html>
<html>
<body>
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<h1>JavaScript 字符串</h1>
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<h2>lastIndexOf() 方法</h2>
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<p>lastIndexOf() 方法返回字符串中指定值最后一次出现的索引（下标）。</p>
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<p>查找最后一次出现的 "planet"：</p>
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<p id="demo"></p>
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<script>
let text = "Hello planet earth, you are a great planet.";
let result = text.lastIndexOf("Planet");
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document.getElementById("demo").innerHTML = result;
</script>
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</body>
</html>
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