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How to use replace method

不言Original: 2019-01-28 13:54:5235760browse

replace方法可以查找正则表达式和字符串之间的匹配项，并使用新的子字符串替换匹配的子字符串，本篇文章我们就来看一下replace方法的具体用法。

首先我们来看一下replace方法的基本语法

string.replace(regexp/substr, newSubStr/function[, flags]);

regexp - 一个RegExp对象。

substr - 要由newSubStr替换的String。

newSubStr - 替换从参数接收的子字符串的String。

function - 要调用以创建新子字符串的函数。

flags - 包含RegExp标志的任意组合的String：g - 全局匹配，i - 忽略大小写，m - 匹配多行。仅当第一个参数是字符串时才使用此参数。

接下来我们来看具体的示例

替换字符串

代码如下

<!DOCTYPE html>
<html>
<head>
	<meta charset="utf-8">
	<title></title>
</head>
<body>
 <script type = "text/javascript">
        var string = "This is a pig!";
        var result = string.replace("pig", "Dog");
        document.write(result);
      </script>       
</body>
</html>

浏览器上输出结果如下：

How to use replace method

替换正则表达式

<!DOCTYPE html>
<html>
<head>
	<meta charset="utf-8">
	<title></title>
</head>
<body>
 <script type = "text/javascript">
        var re = /(\w+)\s(\w+)/;
         var str = "zara ali";
         var newstr = str.replace(re, "$2, $1");
         document.write(newstr);
      </script>       
</body>
</html>

浏览器上显示效果如下

How to use replace method

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