Javascript 替换() 函数
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Javascript replace() function
提问by mseifert
This is a simple replace() question - and I can't get it working to replace a substring in the function below.
这是一个简单的 replace() 问题 - 我无法在下面的函数中替换子字符串。
function linkOnClick(){
var anyNameYouLike = 'some sort of text/string right here';
anyNameYouLike.replace('right','in');
alert(anyNameYouLike)
}
It should return "some sort of text/string in here" but doesn't. What am I doing wrong? I'm fairly new with Javascript (if it isn't obvious...)
它应该返回“这里有某种文本/字符串”，但没有。我究竟做错了什么？我对 Javascript 还很陌生（如果不明显的话......）
回答by Juvanis
anyNameYouLike = anyNameYouLike.replace('right','in');
回答by jfriend00
In javascript, strings are immutable (they are never modified). As such, the .replace()function does not modify the string you call it on. Instead, it returns a new string. So, if you want anyNameYouLiketo contain the modified string, you have to assign the result to it like this:
在 javascript 中，字符串是不可变的（它们永远不会被修改）。因此，该.replace()函数不会修改您调用它的字符串。相反，它返回一个新字符串。所以，如果你想anyNameYouLike包含修改后的字符串，你必须像这样将结果分配给它：
anyNameYouLike = anyNameYouLike.replace('right','in');
For more info, refer to the MDN description of the .replace()methodwhich says this:
有关更多信息，请参阅该.replace()方法的MDN 描述，其中说明：
Returns a new string with some or all matches of a pattern replaced by a replacement. The pattern can be a string or a RegExp, and the replacement can be a string or a function to be called for each match.
返回一个新字符串，其中部分或全部模式匹配项被替换项替换。模式可以是字符串或正则表达式，替换可以是字符串或每次匹配时调用的函数。
And, in the description of the .replace()method, it says this:
并且，在.replace()方法的描述中，它是这样说的：
This method does not change the String object it is called on. It simply returns a new string.
此方法不会更改调用它的 String 对象。它只是返回一个新字符串。
