我如何摆脱这个数组中的逗号？

Question

 const el_Demo = document.getElementById("demo") // demo element function myFunction() { const stringSample = "how was your day?"; const arrayObject = stringSample.split(" ", 2); el_Demo.textContent = arrayObject; const textValue = el_Demo.textContent; el_Demo.textContent = textValue.toUpperCase(); }

 <p id="demo"> ... result after click ...</p> <button class="btn" onclick="myFunction()">click</button>

如果我拆分逗号，那么代码会生成我在 str 变量中写入的完整单词，而不仅仅是 2 个。
如何摆脱出现的逗号？

Answer 1

如果你用res.join(" "); join它您会将其从数组转换为不带逗号的字符串：

document.getElementById("demo").innerHTML = res.join(" ");

Answer 2

您可以使用join(' ')加入数组。

 function myFunction() { var str = "how was your day?"; var res = str.split(" ", 2); document.getElementById("demo").innerHTML = res.join(' '); var txt = document.getElementById("demo").innerHTML; document.getElementById('demo').innerHTML = txt.toUpperCase(); }

 <div id="demo"></div> <button class="btn" onclick="myFunction()">click</button>

其中产生

HOW WAS