如何在 JavaScript 中重复字符串？
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How can I repeat strings in JavaScript?
提问by BrokeMyLegBiking
In JavaScript, how would I create a string of repeating strings x number of times:
在 JavaScript 中，我将如何创建重复字符串 x 次的字符串：
var s = new String(" ",3);
//s would now be " "
回答by Jacob Relkin
There is no such function, but hey, you can create it:
没有这样的功能，但是嘿，你可以创建它：
String.prototype.repeat = function(times) {
return (new Array(times + 1)).join(this);
};
Usage:
用法：
var s = " ".repeat(3);
Of course you could write this as part of a standalone group of functions:
当然，您可以将其编写为一组独立函数的一部分：
var StringUtilities = {
repeat: function(str, times) {
return (new Array(times + 1)).join(str);
}
//other related string functions...
};
Usage:
用法：
var s = StringUtilities.repeat(" ", 3);
回答by Ivo Wetzel
You can also use Array.join:
您还可以使用Array.join：
function repeat(str, times) {
return new Array(times + 1).join(str);
}
> repeat(' ', 3)
" "
回答by peepsalot
Here's a neat way that involves no loops. In addition to being concise, I'm pretty sure using join is much more efficient for very large strings.
这是一种不涉及循环的巧妙方法。除了简洁之外，我很确定使用 join 对于非常大的字符串更有效。
function repeat(str, num) {
return (new Array(num+1)).join(str);
}
You could also put this code on the String prototype, but I'm of the mindset that it's a bad idea to mess with the prototype of built in types.
您也可以将此代码放在 String 原型上，但我认为混淆内置类型的原型是个坏主意。
回答by Lo?c Faure-Lacroix
I think your best and only way to achieve this is to loop over your string.. As far as I know, there is no such feature in any languages.
我认为你最好也是唯一的方法是循环你的字符串。据我所知，任何语言都没有这样的功能。
function multiString(text, count){
var ret = "";
for(var i = 0; i < count; i++){
ret += text;
}
return ret;
}
var myString = multiString(" ", 3);
But I guess you could figure it out.
但我想你可以弄清楚。
回答by Carlos Valenzuela
Haven't you tried with a loop
你有没有试过循环
for (var i = 0; i < 3; i++) {
s += " "; }
?
?
