如何在 JavaScript 中替换特定索引处的字符? [英] How do I replace a character at a particular index in JavaScript?
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问题描述
I have a string, let's say Hello world
and I need to replace the char at index 3. How can I replace a char by specifying a index?
var str = "hello world";
I need something like
str.replaceAt(0,"h");
解决方案
In JavaScript, strings are immutable, which means the best you can do is to create a new string with the changed content and assign the variable to point to it.
You'll need to define the replaceAt()
function yourself:
String.prototype.replaceAt = function(index, replacement) {
return this.substr(0, index) + replacement + this.substr(index + replacement.length);
}
And use it like this:
var hello = "Hello World";
alert(hello.replaceAt(2, "!!")); // He!!o World
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