此问题已经在这里有了答案:
这是我的代码,我要删除<textarea>
的value
。
<textarea name="text" id="text" cols="50" rows="6" placeholder="inset" required></textarea>
<input type="button" id="btn" value="등록">
<input type="button" id="btn1" value="추가">
JS:
document.querySelector("#btn").addEventListener("click", function(e) {
var date = document.querySelector("#date");
var item = document.querySelector("#item");
var sn = document.createElement("div");
var sp = document.createElement("div");
var txt = document.getElementById("text").value;
date.appendChild(sn);
item.appendChild(sp);
date.removeAttribute("id");
item.removeAttribute("id");
sn.setAttribute("id", "date");
sp.setAttribute("id", "item");
sn.append(today);
sp.append(txt);
txt = "";
});
[当我像上面那样编写代码时,我无法删除该值,但是在下面的代码中,它可以工作。为什么会这样?
var date = document.querySelector("#date");
var item = document.querySelector("#item");
var sn = document.createElement("div");
var sp = document.createElement("div");
var txt = document.getElementById("text").value;
date.appendChild(sn);
item.appendChild(sp);
date.removeAttribute("id");
item.removeAttribute("id");
sn.setAttribute("id", "date");
sp.setAttribute("id", "item");
sn.append(today);
sp.append(txt);
document.getElementById("text").value = "";
});
txt = ""; // This changes the value of variable txt as ""
而,
document.getElementById("text").value = ""; // sets the value of element with id "text" to "".