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<!DOCTYPE html> <html> <body> <h1>JavaScript 字符串</h1> <h2>lastIndexOf() 方法</h2> <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> <p>Find the last occurence of "planet", starting at position 20:</p> <p id="demo"></p> <script> let text = "Hello planet earth, you are a great planet."; let result = text.lastIndexOf("planet", 20); document.getElementById("demo").innerHTML = result; </script> </body> </html>