​x
 
<!DOCTYPE html>
<html>
<body>
​
<p>单击按钮，在字符串化中执行对字母“ain”（/ain）的全局（/g）搜索，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>
​