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What are the output methods of js? 4 ways to output content (code example)

青灯夜游Original: 2018-10-29 16:08:0013536browse

How does JavaScript realize the output of content? What are the output methods of js? This article will introduce you to the method of outputting content in js, and let you know the four output statements of js. It has certain reference value. Friends in need can refer to it. I hope it will be helpful to you.

Method 1: js window.alert(); statement output

window.alert() statement: you can output a warning box, and window can Omit. It has a pop-up effect, but because the pop-up is sudden, the user experience is not good. It is basically used for testing code.

Code example:

<script type="text/javascript"> 
    window.alert(&#39;php中文网&#39;)
    alert("网站：www.php.cn")
</script>

Rendering:

What are the output methods of js? 4 ways to output content (code example)

Description:

window.alert() can change the small The content in brackets is displayed in the form of a pop-up window. This content needs to be quoted with a pair of single quotes or a pair of double quotes;

Because window is a BOM object, which refers to the entire browser, it can be omitted. Do not write.

Method 2: js document.write() statement output

document.write() method: you can write the content directly to the html document , output on the page.

Code example:

<script type="text/javascript"> 
    document.write("hello");
    document.write("<h1>通过document.write输出内容</h1>");
</script>

Rendering:

What are the output methods of js? 4 ways to output content (code example)

##Method 3: js console series statement output

The console series of statements can write the content that needs to be output to the browser's console (usually use the F12 key to open and view), and output the content in the console, which is often used during development.

Display the log in the console

console.log();

Prompt a warning in the console

console.warn();

When an error occurs, the error will be displayed in the console

console.error();

Code example:

<script type="text/javascript">
    console.log(&#39;控制台.日志()&#39;);
    console.warn(&#39;控制台.警告()&#39;);
    console.error(&#39;控制台.错误()&#39;);
</script>

Effect picture:

What are the output methods of js? 4 ways to output content (code example)

Method 4: js innerHTML statement output

innerHTML attribute : You can set or return the HTML between the opening and closing tags of the table row.

Basic syntax:

HTMLElementObject.innerHTML=text

HTMLElementObject: node element that needs to output content

text: content that needs to be output

Code example:

<!DOCTYPE html>
<html>

<head>
<meta charset="UTF-8">
<title>通过innerHTML方法向页面元素中输出内容</title>
</head>
<script>
function changeContent() {
document.getElementById("demo").innerHTML = "通过innerHTML方法向页面输出了内容";
}
</script>

<body>
<h1 id="demo">我是一个标题</h1>
<button type="button" onclick="changeContent()">更改内容</button>
</body>

</html>

Rendering:

What are the output methods of js? 4 ways to output content (code example)

Summary: The above are the four js output methods introduced in this article, each with its own characteristics You can try it yourself to deepen your understanding and use different output methods according to different situations or needs. I hope it will be helpful to everyone's learning. For more related tutorials, please visit

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