<html><body><p>单击该按钮可对字符范围 [a-s] 进行不区分大小写的全局搜索。</p><button onclick="myFunction()">试一试</button><p id="demo"></p><script>function myFunction() { var str = "I Scream For Ice Cream, is that OK?!"; var patt1 = /[a-s]/gi; var result = str.match(patt1); document.getElementById("demo").innerHTML = result;}</script></body></html>