replace替换，全局和局部替换

<script>
var a=document.getElementById("introduce").innerHTML;
var b=a.replace(/jone/i,"toni");   //局部替换字符
var b=a.replace(/jone/g,"toni");   //全部替换字符
document.getElementById("introduce").innerHTML=b;
</script>
<p id="introduce">
jone,你好，你再；jone，你多大了
</p>