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首页 > 解决方案 > 如何在与 html 不同的文件中编写 Paper.js 脚本？（我已按照图书馆的说明进行操作，但仍然无法正常工作）

javascript - 如何在与 html 不同的文件中编写 Paper.js 脚本？（我已按照图书馆的说明进行操作，但仍然无法正常工作）

问题描述

这看起来很傻，但很烦人。我正在使用 VScode，我正在尝试在不同的文件中编写一个 js 脚本以获得高亮语法，但它不起作用（我可以按照另一个 stackoverflow 问题中的建议更改 json 内容并将其输入内联，但我会喜欢有一个单独的文件）。

这些文件都在同一个文件夹中：

如果我尝试使用内联脚本运行 html 页面，则 chrome 会顺利加载

内联脚本的 circles.html

圈子.html

<!DOCTYPE html>
<html>
    <head>
        <title>Circles</title>
        <!-- Load the Paper.js library -->
        <script type="text/javascript" src="paper-full.js"></script>
        <link rel="stylesheet" type="text/css" href="circles.css">
        <!-- <script type="text/paperscript" src="circles.js" canvas="myCanvas"></script> -->
        <script type="text/paperscript" canvas="myCanvas">
            // Create a Paper.js Path to draw a line into it:
            var path = new Path();
            // Give the stroke a color
            path.strokeColor = 'black';
            var start = new Point(100, 100);
            // Move to start and draw a line from there
            path.moveTo(start);
            // Note the plus operator on Point objects.
            // PaperScript does that for us, and much more!
            path.lineTo(start + [ 100, -50 ]);
        </script>
    </head>
    <body>
        <canvas id="myCanvas" resize></canvas>
    </body>
</html>

但是当我尝试为这个脚本获取一个单独的文件时（如http://paperjs.org/tutorials/getting-started/working-with-paper-js/中建议的），浏览器给出错误

circles.html 和 circles.js，在不同的文件中

圈子.html

<!DOCTYPE html>
<html>
    <head>
        <title>Circles</title>
        <!-- Load the Paper.js library -->
        <script type="text/javascript" src="paper-full.js"></script>
        <link rel="stylesheet" type="text/css" href="circles.css">
        <!-- <script type="text/paperscript" src="circles.js" canvas="myCanvas"></script> -->
        <script type="text/paperscript" canvas="myCanvas" src="circles.js"></script>
    </head>
    <body>
        <canvas id="myCanvas" resize></canvas>
    </body>
</html>

圈子.js

// Create a Paper.js Path to draw a line into it:
var path = new Path();
// Give the stroke a color
path.strokeColor = 'red';
var start = new Point(100, 100);
// Move to start and draw a line from there
path.moveTo(start);
// Note the plus operator on Point objects.
// PaperScript does that for us, and much more!
path.lineTo(start + [ 100, -50 ]);

var myCircle = new Path.Circle(new Point(100, 70), 50);
myCircle.fillColor = 'black';

浏览器提醒：

错误一：

Access to XMLHttpRequest at 'file:///Users/jarvis/Documents/webnoob/webdev/basscolors/circles.js' from origin 'null' has been blocked by CORS policy: Cross origin requests are only supported for protocol schemes: http, data, chrome, chrome-extension, https.

request @ paper-full.js:13929

paper-full.js:13929

错误2：

Uncaught DOMException: Failed to execute 'send' on 'XMLHttpRequest': Failed to load 'file:///Users/jarvis/Documents/webnoob/webdev/basscolors/circles.js'.

    at Object.request (file:///Users/jarvis/Documents/webnoob/webdev/basscolors/paper-full.js:13929:14)

    at HTMLCollection.loadScript (file:///Users/jarvis/Documents/webnoob/webdev/basscolors/paper-full.js:16957:10)

    at HTMLCollection.forIn (file:///Users/jarvis/Documents/webnoob/webdev/basscolors/paper-full.js:56:11)

    at Function.each (file:///Users/jarvis/Documents/webnoob/webdev/basscolors/paper-full.js:75:7)

    at loadAll (file:///Users/jarvis/Documents/webnoob/webdev/basscolors/paper-full.js:16974:8)

警告：

[Deprecation] Synchronous XMLHttpRequest on the main thread is deprecated because of its detrimental effects to the end user's experience. For more help, check https://xhr.spec.whatwg.org/.

request @ paper-full.js:13905

我已经通过谷歌尝试了一些关于这个错误的答案，但他们都没有真正解决它，看来我正在伤害 http 协议。我应该如何解决它，我错过了什么？

标签： javascripthtmlfilevisual-studio-codeshared-libraries

解决方案

PaperScript 代码的加载与使用该<script>标签的任何其他 JavaScript 一样，除了类型设置为 "text/paperscript" 或 "text/x-paperscript" 。代码可以是外部文件（src="URL"），也可以是内联的：

<!DOCTYPE html>
<html>
<head>
<!-- Load the Paper.js library -->
<script type="text/javascript" src="js/paper.js"></script>
<!-- Define inlined PaperScript associate it with myCanvas -->
<script type="text/paperscript" canvas="myCanvas">
    // Create a Paper.js Path to draw a line into it:
    var path = new Path();
    // Give the stroke a color
    path.strokeColor = 'black';
    var start = new Point(100, 100);
    // Move to start and draw a line from there
    path.moveTo(start);
    // Note the plus operator on Point objects.
    // PaperScript does that for us, and much more!
    path.lineTo(start + [ 100, -50 ]);
</script>
</head>
<body>
    <canvas id="myCanvas" resize></canvas>
</body>
</html>

如果我们将内联代码复制到名为 js/myScript.js 的文件中，我们可以重写上面的示例以加载外部文件。

<!DOCTYPE html>
<html>
<head>
<!-- Load the Paper.js library -->
<script type="text/javascript" src="js/paper.js"></script>
<!-- Load external PaperScript and associate it with myCanvas -->
<script type="text/paperscript" src="js/myScript.js" canvas="myCanvas">
</script>
</head>
<body>
    <canvas id="myCanvas" resize></canvas>
</body>
</html>

来源： http: //paperjs.org/tutorials/getting-started/working-with-paper-js/

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