在字符串中全局搜索 "Hello" 和 "蜜蜂教程" 字符串 - 在线编辑器

          <script>
  var str = "Hello world!";
  //查找"Hello"
  var patt = /Hello/g;
  var result = patt.exec(str);
  document.write("返回值: " + result);
  //查找 "Mifeng"
  patt = /Mifeng/g;
  result = patt.exec(str);
  document.write("<br>返回值: " + result);
</script>
        