字符串的replace方法

Finds the first occurrence of str1 in the current string and replaces it with str2.

查找当前字符串中第一个出现的str1并将其替换为str2 。

Returns a new string without mutating the original one.

返回一个新字符串，而不改变原始字符串。

'JavaScript'.replace('Java', 'Type') //'TypeScript'

You can pass a as the first argument:

您可以将作为第一个参数传递：

'JavaScript'.replace(/Java/, 'Type') //'TypeScript'

replace() will only replace the first occurrence, unless you use a regex as the search string, and you specify the global (/g) option:

除非您使用正则表达式作为搜索字符串，并且指定了全局( /g )选项，否则replace()将仅替换第一个匹配项：

'JavaScript JavaX'.replace(/Java/g, 'Type') //'TypeScript TypeX'

The second parameter can be a function. This function will be invoked when the match is found (or for every match foundm if using a global regex /g), with a number of arguments:

第二个参数可以是一个函数。 找到匹配项(或使用全局正则表达式/g 每个匹配项发现)时，将使用以下参数调用此函数：

• the string that matches the pattern
  与模式匹配的字符串
• an integer that specifies the position within the string where the match occurred
  一个整数，指定匹配发生在字符串中的位置
• the string
  字符串

The return value of the function will replace the matched part of the string.

函数的返回值将替换字符串的匹配部分。

Example:

例：

'JavaScript'.replace(/Java/, (match, index, originalString) => {  console.log(match, index, originalString)  return 'Test'}) //TestScript

This also works for regular strings, not just regexes:

这也适用于常规字符串，而不仅仅是正则表达式：

'JavaScript'.replace('Java', (match, index, originalString) => {  console.log(match, index, originalString)  return 'Test'}) //TestScript

In case your regex has capturing groups, those values will be passed as arguments right after the match parameter:

如果您的正则表达式具有捕获组 ，则这些值将在match参数之后作为参数传递：

'2015-01-02'.replace(/(?
     
      \d{4})-(?
      
       \d{2})-(?
       
        \d{2})/, (match, year, month, day, index, originalString) => {  console.log(match, year, month, day, index, originalString)  return 'Test'}) //Test
       
      
     

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字符串的replace方法