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<!DOCTYPE html> <html> <body> <h1>JavaScript 字符串方法</h1> <p>indexOf() 方法接受第二个参数作为搜索的起始位置：</p> <p id="demo"></p> <script> var str = "The full name of China is the People's Republic of China."; var pos = str.indexOf("China",18); document.getElementById("demo").innerHTML = pos; </script> </body> </html>