<p>单击按钮将段落中“Microsoft”替换成“Twle”：</p>

<p id="demo">Visit Microsoft!</p>

<button onclick="myFunction()">点我</button>

<script>

function myFunction(){

    var str=document.getElementById("demo").innerHTML;

    var n=str.replace("Microsoft","Twle");

    document.getElementById("demo").innerHTML=n;

}

</script>

​