javascript printer component installation

With the development of the Internet, more and more web pages need to support printing functions. The JavaScript printer component is a very excellent tool that can help us quickly print web pages. This article will introduce the installation method and usage skills of the JavaScript printer component.

1. Install the JavaScript printer component

First, we need to download the JavaScript printer component. Here is an open source JavaScript printing library recommended: Print.js. Print.js is an easy-to-use library that does not require any third-party libraries, supports custom styles, and has multiple printing methods.

After opening the official website of Print.js (https://printjs.crabbly.com/), we can see that the official provides three installation methods:

1. Introduction through CDN

This method is the simplest, just copy the following code into the HTML file:

<script src="https://printjs-4de6.kxcdn.com/print.min.js"></script>

2. Use the NPM package to install

If you are using Node.js environment, you can use the following command to install:

npm install print-js

3. Manual download

You can also manually download the Print.js code on GitHub, or download the latest version of Print on the official website .js compressed package and extract it into your project.

2. Use JavaScript printer component

1. Print text

Because Print.js is very convenient to use, you only need to call a function to realize the printing function. The following is a simple example of printing text:

<script>
    function printText() {
        var text = "这是一段测试文本。";
        printJS({printable: text, type: 'raw'})
    }
</script>

<button onclick="printText()">打印文本</button>

In the above code, we define a JavaScript function printText(), which is used to initialize the printing component and print the specified text. Among them, printable is the text we want to output through the printer, and the type parameter specifies the type of printed content. Here we declare it as raw, which means that the printed text is the original text.

In the HTML file we added a button. When the user clicks the button, the printText() function will be called and the text will be printed.

2. Print web pages

In addition to printing text, the JavaScript printer component can also help us print the entire web page, including styles and pictures, etc. The following is a simple web page printing example:

<script>
    function printPage() {
        printJS({printable: 'https://www.example.com', type: 'url'})
    }
</script>

<button onclick="printPage()">打印网页</button>

In the above code, we define a JavaScript function named printPage(). When the user clicks the button, this function will be referenced to initialize the printing component. and print the entire web page.

In this example, we specify that the content type to be printed is URL, and the web page address to be printed is the specified https://www.example.com.

3. Customized print style

The JavaScript printer component also supports custom print styles, which can help us choose appropriate fonts and typesetting settings when printing. The following is an example of a customized print style:

<script>
    function printStyledText() {
        var text = "这是一段测试文本。";
        var style = "<style>body {font-family: Arial, sans-serif; font-size: 12pt;}";
        printJS({printable: style + text, type: 'raw'})
    }
</script>

<button onclick="printStyledText()">打印格式化文本</button>

In the above code, when defining the function printStyledText(), we use the style variable to specify the CSS style to be used, in which the font-family and font-family under the body The font-size attribute specifies the style of printed text. In addition, we embed style in the printable content, and the final printed text will have this style.

In this example, we can further change the appearance of the printed content by modifying the CSS style.

3. Summary

This article introduces the installation method and usage skills of the JavaScript printer component, and shows examples of printing text, printing web pages, and customizing printing styles. By using these methods, we can quickly implement the printing function of web pages and perfectly control the appearance of printed content.

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