JavaScript 字符函数replace函数 的应用案例

<script type="text/javascript">
    //替换字符
    var beginStr = "visit abc,you is abc ,I is ABC,he is aBC";
    var afterStr = beginStr.replace("abc", "loaf"); //返回 visit loaf;
   // alert(afterStr);


    //替换所有字符
    var replaceAllStr = beginStr.replace(/abc/g, "loaf"); //替换所有的abc;注意正则不要加引号
   // alert(replaceAllStr);

    //统一大小写
   var text = "javascript Tutorial";
   var txt = text.replace(/javascript/i, "JavaScript");
  // alert(txt);


   //替换左右2层的键值对
   var keyStr = "key|value";
   var keyStrChange=keyStr.replace(/(\w+)\s*\|\s*(\w+)/,"$2|$1");
   //alert(keyStrChange); //返回value|key

   var k = "Visul Stiduo2010,office2010";
   var kk = k.replace(/(?<=office)2010/i, "$1,---")
   alert(kk); //返回 



</script>