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源代码：
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<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>安科教程(www.ancii.com)</title> </head> <body> <p id="demo">单击按钮显示“苹果”最后一次出现的位置：</p> <button onclick="myFunction()">点我</button> <script> function myFunction(){ var fruits=["Banana","Orange","Apple","Mango","Banana","Orange","Apple","Mango"]; var a=fruits.lastIndexOf("Apple") var x=document.getElementById("demo"); x.innerHTML=a; } </script> <p><b>注意:</b>lastIndexOf方法在JavaScript 1.6被引进，在Internet Explorer 8或更早的版本中不支持。</p> </body> </html>
运行结果
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