如何使用 javascript 在页面开头或图像标签之前将标题元素添加到 html 文档中
[英]How to add a heading element into a html document at the start of the page or before the image tags using javascript
问题描述
I am trying to add a heading tag using javascript in a html document along with trying to swap 2 images, I want this heading tag at the top of the page.(I am new to js so there might be some mistakes in the code) This is the html page code.
我正在尝试在 html 文档中使用 javascript 添加一个标题标签，同时尝试交换 2 个图像，我希望这个标题标签位于页面顶部。（我是 js 新手，因此代码中可能存在一些错误）这是 html 页面代码。
<html>
<head>
<link rel="stylesheet" href="style1.css">
</head>
<body>
<img src="1123013.jpg" id="left" >
<img src="1189318.png" id="right" >
<form>
<input type="email" id="email" value="manuojha1@gmail.com">
<br>
<input type="password" id="password" value="password">
<br>
<button id="reset">Reset</button>
</form>
<script src="script1.js"></script>
</body>
This is the javascript code I have written so far, I cannot find a way to insert the heading tag at the top of the page.这是我到目前为止编写的 javascript 代码，我找不到在页面顶部插入标题标签的方法。
let heading=document.createElement("h1");
heading.textContent="This is the sample heading";
body.append(heading);
heading.textContent="this is inserted heading";
body.append(heading);
let img1=document.getElementById("left");
let img2=document.getElementById("right");
console.log(img1,img2);
let swap=function(){
let temp=img1.src;
img1.src=img2.src;
img2.src=temp;
};
img1.addEventListener("click",function(){
console.log("image 1 clicked");
swap();
});
img2.addEventListener("click",function(){
console.log("image 2 clicked");
swap();
});
console.log(img2.src);
let input=document.getElementsByTagName("input");
let reset=document.getElementById("reset");
reset.addEventListener("click",function(){
input[0].defaultValue="default@123";
input[1].defaultValue="def";
console.log("reset button clicked");
});```
1 个解决方案
解决方案1
0 2021-12-16 13:37:24
let html = Heading`; let html =标题`;
let update = document.querySelector('body');
if(update){
update.append(html);
}
` `
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