JavaScript replace() 方法

https://www.w3school.com.cn/jsref/jsref_replace.asp

实例
例子 1
在本例中，我们将使用 "W3School" 替换字符串中的 "Microsoft"：

<script type="text/javascript">

var str="Visit Microsoft!"
document.write(str.replace(/Microsoft/, "W3School"))

</script>

输出：

Visit W3School!

例子 2
在本例中，我们将执行一次全局替换，每当 "Microsoft" 被找到，它就被替换为 "W3School"：

<script type="text/javascript">
       var str="Welcome to Microsoft! "
       str=str + "We are proud to announce that Microsoft has "
      str=str + "one of the largest Web Developers sites in the world."
      document.write(str.replace(/Microsoft/g, "W3School"))
</script>

输出：

Welcome to W3School! We are proud to announce that W3School
has one of the largest Web Developers sites in the world.