'HTMLElement‘类型的值上不存在属性' value’

<html>
    </head>
        <p id="greet"></p>
            <input id="name" type="text" name="name" value="" onkeyup="greet('name')" />
        </form>
    </body>
    <script src="greeter.js"></script>
</html>

function greeter(person)
    return "Hello, " + person;
function greet(elementId)
    var inputValue = document.getElementById(elementId).value;
    if (inputValue.trim() == "")
        inputValue = "World";
    document.getElementById("greet").innerText = greeter(inputValue);
}

document.getElementById(elementId).value

public Object foo() {
  return 42;
foo().signum();

function greet(elementId) {
    var inputValue = document.getElementById(elementId)["value"];
    if(inputValue.trim() == "") {
        inputValue = "World";
    document.getElementById("greet").innerText = greeter(inputValue);
}

var inputElement = <HTMLInputElement>document.getElementById('greet');
inputElement.value = greeter(inputValue);

var inputValue = (<HTMLInputElement>document.getElementById(elementId)).value;

inputValue = (document.getElementById(elementId)).value;

Code: var content: string = ( < HTMLScriptElement > document.getElementById(contentId)).text;

let inputValue = (document.getElementById(elementId) as HTMLInputElement).value;

("" as HTMLInputElement).value;

var val = (this.refs.newText as HTMLInputElement).value;
alert("Saving this:" + val);

const inputElement: HTMLInputElement = document.getElementById('greet')

const inputElement = document.getElementById('greet') as HTMLInputElement

const inputValue = inputElement.value // now inferred to be string

const element = document.getElementById('elemId') as HTMLInputElement;

let inputValue = (swal.getPopup().querySelector('#inputValue ')as HTMLInputElement).value

//element_id = you dynamic id.
//dynamic_val = you dynamic value.
let _el = document.getElementById(element_id);
_el.value = dynamic_val.toString();

const inputValue = document.querySelector<HTMLInputElement>('#greet')!.value;

const inputs = document.querySelectorAll<HTMLInputElement>('.my-input');

function myInput() { (document.getElementById(elementId) as HTMLInputElement).value = '' }

<form id="my-form" 
   action="index.html"
   method="get"
   onsubmit="return showValue();">
    <input type="text" name="username">
    <input type="text" name="full-name">
    <input type="password" name="password">

'HTMLElement‘类型的值上不存在属性' value’

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