<script>
        function replacer(word) {
          return 'hello';
        }
        var newString = 'abc[你好]de[他]fg'.replace(/^\[[^\u0000-\u00FF]{1,2}\]$/gi, replacer);
        alert(newString)//todo:为什么这里显示的不是hellohello,我想把[你好][他]替换成hello
    
    </script>