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<!DOCTYPE html>
<html>
<body>
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<h2>JavaScript String 方法</h2>
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<p>lastIndexOf() 方法返回指定文本最后一次出现的位置：</p>
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<p id="demo"></p>
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<script>
let str = "Please locate where 'locate' occurs!";
document.getElementById("demo").innerHTML = str.lastIndexOf("locate");
</script>
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</body>
</html>
​