js替换函数用法

定义和用法

replace() 方法用于在字符串中用一些字符替换另一些字符,或替换一个与正则表达式匹配的子串。

语法

stringObject.replace(regexp/substr,replacement)

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.

参考:

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

原文地址:

https://www.cnblogs.com/poterliu/p/11009330.html

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转载自www.cnblogs.com/poterliu/p/11009330.html