关于javascript：如何找到句子中的所有空格并替换忽略它们？

How can I find all of the spaces in a sentence and replace ignore them?

我正在做一个JavaScriptHangman游戏，我需要打印出与随机选择的单词长度相同的破折号。我做到了，但它也打印出了一个破折号，以填补句子中的空白，所以我怎么能忽略这些空格，只打印出一个破折号，以填补句子中的字母呢？感谢您的帮助。

这是打印破折号的代码

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for(var i = 0; i < sayings[randomSaying].length; i++)
{
progress.innerHTML +="-";
}

随机变量

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var sayings = [
"cash on the nail",
"charley horse",
"foul play",
"bury the hatchet",
"hands down",
"if the cap fits",
"mumbo jumbo",
"see red",
"stone the crows",
"thick and thin",
]
sayings.toString();
var randomSaying = Math.floor(Math.random()*sayings.length);