xxxxxxxxxx<html><head><meta charset="utf-8"><title>W3Cschool教程(w3cschool.cn)</title></head><body><p>搜索字符串 "W3cSchool", 并显示匹配的起始位置：</p><button onclick="myFunction()">点我</button><p id="demo"></p><script>function myFunction() { var str = "Visit W3cSchool!"; var n = str.search("W3cSchool"); document.getElementById("demo").innerHTML = n;}</script></body></html>