<html><body><p>进行全局搜索，并在字符串中测试“Hello”和“BEGTUT”：</p><button onclick="myFunction()">试一试</button><p id="demo"></p><script>function myFunction() { var str = "Hello world!"; // look for "Hello" var patt = /Hello/g; var result = patt.test(str); // look for "BEGTUT" patt2 = /BEGTUT/g; result2 = patt2.test(str); document.getElementById("demo").innerHTML = result + "<br>" + result2;}</script></body></html>