<html><body><p>单击该按钮可执行全局 (/g) 搜索字符串中的字母“ain”(/ain)，并显示匹配项。</p><button onclick="myFunction()">试一试</button><p id="demo"></p><script>function myFunction() { var str = "The rain in SPAIN stays mainly in the plain"; var res = str.match(/ain/g); document.getElementById("demo").innerHTML = res;}</script></body></html>