vs.code.value无法被智能感知识别 [英] Vs code .value is not recognized by intellisense
问题描述
我对javascript很陌生，但是在工作时，我试图找出一种方法来获取用户将输入到html输入文本框中的文本，但是由于某种原因vs代码无法识别所需的intellisense去做这个. [我的html代码:
I am very new to javascript, but as I was working I was trying to figure out a way to get the text a user would input into an html input text box, but for some reason vs code does not recognize the intellisense required to do this. [my html code:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
</head>
<body>
<input type="text" id="first-input">
<button id="submit-button">Submit</button>
<script src="main.js" type="text/javascript"></script>
</body>
</html>
] 1
[
let firstInput = document.getElementById('first-input');
let submitButton = document.getElementById('submit-button');
submitButton.onclick = function () {
console.log(firstInput.value);
}
] 2
为了在输入文本元素中获取数据，该代码为.value，但是，当我开始输入".val-"时，唯一的VS代码推荐是.nodeValue.
In order to get the data inside an input text element, the code for that is .value, however when i start typing ".val-" the only recommendation VS code has is for .nodeValue.
这意味着，为了得到我想要的，我使用的是vs代码的intellisense无法识别的命令.但是，即使intellisense找不到它，代码仍然可以按预期运行.
This means, in order to get what I want, I am using a command that the intellisense for vs code doesn't recognize. However, even though intellisense does not find it, the code still operates as intended.
是否需要安装或执行某些操作才能访问此信息?我担心还有许多其他事情无法识别，这会使学习这种语言变得更加困难.预先感谢
Is there something I need to install or do to get access to this information? I am concerned there are many other things it doesn't recognize and will make learning this language more difficult. Thanks in advance
推荐答案
这是因为getElementById()不一定返回具有.value属性的元素.例如，它可以返回<div>元素.
This is because getElementById() doesn't necessarily return an element with a .value property. For example, it could return a <div> element.
为了使智能感知知道您将拥有一个.value属性，您必须使用JSDoc注释指示变量firstInput将是一个<input>元素.像这样:
In order for the intellisense to know that you will have a .value property, you have to indicate with a JSDoc comment that the variable firstInput is going to be an <input> element. Like this:
/**
* @type HTMLInputElement
*/
let firstInput = document.getElementById('first-input');
/**
* @type HTMLButtonElement
*/
let submitButton = document.getElementById('submit-button');
submitButton.onclick = function () {
console.log(firstInput.value);
}
不要让您感到困惑，但是VSCode使用TypeScript增强其智能感知能力，
Not to confuse you, but VSCode uses TypeScript to power its intellisense, even for JavaScript code.
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