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How to replace a string using JavaScript's replace

不言Original: 2018-12-22 14:13:014890browse

The replace function can replace the specified character in the string with another character. In addition, by using the replacement rules of regular expressions, various patterns can also be replaced. The following article will come Introducing the specific method of replacing strings in How to replace a string using How to replace a string using JavaScripts replaces replace.

How to replace a string using How to replace a string using JavaScripts replaces replace

Usage of replace function

Basic syntax

String.replace(模式, 替换的文字[, flag])

flag can be omitted.

Example of replacement processing using replace

The basic code is as follows

<!DOCTYPE html>
<html>
  <head>
    <meta charset = "utf-8">
    <title>How to replace a string using How to replace a string using JavaScripts replaces replace</title>
  </head>
  <body>
    <script>
      var str1 = "今天是一个晴天！";
      var newstr1 = str1.replace("晴天", "雨天");
      console.log(str1); 
      console.log(newstr1);

      var str2 = "我的名字叫张三,<br>今年10岁了。";
      var newstr2 = str2.replace(/<br>/g, "\n");
      console.log(str2); 
      console.log(newstr2);
    </script>
  </body>
</html>

The running results are as follows

How to replace a string using How to replace a string using JavaScripts replaces replace

Let’s analyze the above code

var str1 = "今天是一个晴天！";
var newstr1 = str1.replace("晴天", "雨天");
console.log(str1); 
console.log(newstr1);

This is text replacement, we first define a str1 variable , and replace "sunny day" with "rainy day" in the newstr1 variable. As a result, the string "Today is a sunny day!" is output.

var str2 = "我的名字叫张三,<br>今年10岁了。";
var newstr2 = str2.replace(/<br>/g, "\n");
console.log(str2); 
console.log(newstr2);

This is a replacement using regular expressions, "/
/g" means "all
", "\n" means newline.

The above code replaces all the effects represented by
with the effects represented by \n.

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