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在 JavaScript 中用下划线替换空格

作者:迹忆客 最近更新:2023/03/09 浏览次数:

在 JavaScript 中,我们可以使用默认的 JavaScript 字符串方法,如 replace()split()join() 等,用提供的字符串部分替换字符串中的单个或多个空格。

replace() 是 JavaScript 中的预定义方法,我们在字符串上使用它来用另一个字符串替换该字符串的已定义部分。它从完整声明的字符串中搜索定义的字符串部分,并将其替换为给定的值。

replace() 方法不会更改原始字符串;它返回更新的字符串。

我们将初始化包含空格的字符串并测试用下划线替换空格的 replace 方法。我们将使用带有修饰符集 (g) 的正则表达式来替换所有实例。

<script>
let string = "Delft stack is a good website to learn programming"

let resultOne = string.replace(" ","_") //replace one
let resultAll = string.replace(/\s+/g, '_'); //replace all

  console.log("original string: "+string)
  console.log("updated string for one: "+resultOne)
  console.log("updated string for all: "+resultAll)
</script>

输出:

"original string: Delft stack is a good website to learn programming"
"updated string for one: Delft_stack is a good website to learn programming"
"updated string for all: Delft_stack_is_a_good_website_to_learn_programming"

在 JavaScript 中,split() 是一个预定义的方法。它将声明的字符串拆分为子字符串数组。

split() 方法不会更改原始字符串;它返回一个新的字符串字符数组。

join() 方法从数组中返回一个字符串;它不会改变原始数组。

我们可以在字符串上使用带有 join()split() 方法来用另一个字符串替换已定义的部分。我们将初始化包含空格的字符串并测试 splitjoin 方法以用下划线替换空格。

<script>
let string = "Delft stack is a good website to learn programming"

let result = string.split(' ').join('_');

console.log("original string: "+string)
console.log("updated string: "+result)
</script>

输出:

"original string: Delft stack is a good website to learn programming"
"updated string: Delft_stack_is_a_good_website_to_learn_programming"

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