动态生成的图标 [英] Dynamically generated favicon

问题描述

是否可以使用JavaScript和HTML动态生成图标，使用当前页面的图标作为背景，以及前景中的随机数？

Would it be possible using only JavaScript and HTML to dynamically generate a favicon, using the current page's favicon as a background, and a random number in the foreground?

例如，假设当前的favicon看起来类似于：

For example, lets say the current favicon looks similar to this:

======================
====XXXXXXXXXXXXXX====
====X=================
====X=================
====X=====XXXXXXXX====
====X============X====
====X============X====
====XXXXXXXXXXXXXX====
======================

如果可能的话，我怎样才能使用JavaScript和HTML看到类似的内容：

If possible, how would I get it to look something similar to this using only JavaScript and HTML:

======================
====XXXXXXXXXXXXXX====
====X=================
====X=================
====X=====XXXXXXXX====
====X=========--111--=
====X=========--1-1--=
====XXXXXXXXXX----1--=
==============--1111-=

地图：

= ：白色背景

x ：原始Favicon图片

- ：红色生成的图像带数字

1 ：白色文字

map:
= : white background
x : Original Favicon image
- : Red generated image with a number
1 : White text

想法：

• 画布？


• 数据Uri？

推荐答案

编辑：搞定了

var canvas = document.createElement('canvas');
    canvas.width = 16;canvas.height = 16;
    var ctx = canvas.getContext('2d');
    var img = new Image();
    img.src = '/favicon.ico';
    img.onload = function() {
        ctx.drawImage(img, 0, 0);
        ctx.fillStyle = "#F00";
        ctx.fillRect(10, 7, 6, 8);
        ctx.fillStyle = '#FFFFFF';
        ctx.font = 'bold 10px sans-serif';
        ctx.fillText('2', 10, 14);

        var link = document.createElement('link');
        link.type = 'image/x-icon';
        link.rel = 'shortcut icon';
        link.href = canvas.toDataURL("image/x-icon");
        document.getElementsByTagName('head')[0].appendChild(link);
    }

您实际上可以运行chrome并将其粘贴：

You can actually run chrome and paste this:

javascript: var canvas = document.createElement('canvas');canvas.width = 16;canvas.height = 16;var ctx = canvas.getContext('2d');var img = new Image();img.src = '/favicon.ico';img.onload = function() {ctx.drawImage(img, 0, 0);ctx.fillStyle = "#F00";ctx.fillRect(10, 7, 6, 8);ctx.fillStyle = '#FFFFFF';ctx.font = 'bold 10px sans-serif';ctx.fillText('2', 10, 14);var link = document.createElement('link');link.type = 'image/x-icon';link.rel = 'shortcut icon';link.href = canvas.toDataURL("image/x-icon");document.getElementsByTagName('head')[0].appendChild(link);}

进入浏览器并且看到它在行动。

into the browser and see it in action.

这篇关于动态生成的图标的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！