<script?type="text/javascript">
????var?str?=?'a?b?c?d?e';

????function?changeStr(beginIndex,str){
????????var?strs?=?str.split('?');
????????var?newStrs?=?[];
????????for(var?i?=?0;?i<?strs.length;i++){
????????????newStrs.push(strs[i]+?(i+beginIndex));
????????}
????????return?newStrs.join('?');
????}
????alert(changeStr(6,str));
</script>

可以試試

直接賦值？