如何在输入标签中使用javasript显示实时输入？(How to show real time input using javascript in input tag?)

我怎样才能使这个脚本运行通过替换textarea标记与输入标记？ 我在我的页面中使用了输入标签，并希望添加此代码，但此代码使用了textarea。 如果我更改textarea输入代码不起作用。

function setFontText(text) {
  document.getElementById("Courier_new").innerHTML = text;
  document.getElementById("Arial_Black").innerHTML = text;
} 
  
<textarea id="textField0" autocomplete="off" style="font-family:'Alex Brush';" onkeyup="javascript:setFontText(this.value);" rows="2" name="textField0"></textarea> Multiple text area:

<textarea id="Courier_new" class="fontTextArea2" style="font-family:Courier;" autocomplete="off" name="Courier new"></textarea>

<textarea id="Arial_Black" class="fontTextArea2" style="font-family:Arial; " autocomplete="off" name="Arial Black"></textarea> 
  
 
How can I make this script run by replacing textarea tag with input tag? I used input tag in my page and wanna add this code but this code used textarea. if I change textarea to input the code doesn't work.
 
 
 
  
  
function setFontText(text) {
  document.getElementById("Courier_new").innerHTML = text;
  document.getElementById("Arial_Black").innerHTML = text;
} 
  
<textarea id="textField0" autocomplete="off" style="font-family:'Alex Brush';" onkeyup="javascript:setFontText(this.value);" rows="2" name="textField0"></textarea> Multiple text area:

<textarea id="Courier_new" class="fontTextArea2" style="font-family:Courier;" autocomplete="off" name="Courier new"></textarea>

<textarea id="Arial_Black" class="fontTextArea2" style="font-family:Arial; " autocomplete="off" name="Arial Black"></textarea> 
  
 

                
最满意答案
                
                    
                        
 尝试这个：- 
 
function setFontText(text) {
  document.getElementById("Courier_new").value = text;
  document.getElementById("Arial_Black").value = text;
}
 
 或者，使用document.getElementsByClassName 
 
 方法.getElementsByClassName（）返回一个类似数组的对象，所以你必须访问第一个元素（如果有的话）。 
 
var elements = document.getElementsByClassName("anyclass);
var value = elements[0].value;

alert(value); // 1
 
 或者，您也可以使用.querySelector（）方法： 
 
var value = document.querySelector('.anyclass').value;
alert(value); // 1
 Try this:-
 
function setFontText(text) {
  document.getElementById("Courier_new").value = text;
  document.getElementById("Arial_Black").value = text;
}
 
Or, Using document.getElementsByClassName
 
The method .getElementsByClassName() returns an array-like object of elements.so you have to access first element (if there is any). 
 
var elements = document.getElementsByClassName("anyclass);
var value = elements[0].value;

alert(value); // 1
 
or, you could also use the .querySelector() method:
 
var value = document.querySelector('.anyclass').value;
alert(value); // 1