html使用canvas画矩形（CSS、SVG和canvas分别实现文本文字纹理叠加效果）

<h2 class="pattern-overlay">
    <span data-text="CSS纹理叠加"></span>
    CSS纹理叠加
</h2>
.pattern-overlay {
    font-size: 60px;
    font-family: 'microsoft yahei';
    background-image: url(./pattern01.jpg" alt="html使用canvas画矩形（CSS、SVG和canvas分别实现文本文字纹理叠加效果）" border="0" />

.fill-bg {
    -webkit-text-fill-color: transparent;
    -webkit-background-clip: text;
}

<h2 class="pattern-overlay">CSS纹理叠加</h2>
.pattern-overlay {
    font-size: 60px;
    font-family: 'microsoft yahei';
    background-image: linear-gradient(to bottom, #f00, #f00), url(./pattern01.jpg" alt="html使用canvas画矩形（CSS、SVG和canvas分别实现文本文字纹理叠加效果）" border="0" />

<svg width="360" height="120">
  <defs>
    <filter id="blend">
     <feImage xlink:href="./pattern01.jpg" alt="html使用canvas画矩形（CSS、SVG和canvas分别实现文本文字纹理叠加效果）" border="0" />

// 先引入context_blender.js，然后……
// canvas绘制脚本
var canvas = document.querySelector('canvas');
var context = canvas.getContext('2d');
var width = canvas.width, height = canvas.height;
context.textBaseline = 'middle';
context.font = 'bold 60px "Microsoft Yahei"';
// 绘制方法
var draw = function () {    
    context.clearRect(0, 0, width, height);
    // 渐变和纹理
    var gradient, pattern;
    // 创建材质canvas
    var canvasPattern = document.createElement('canvas');
    var contextUnder = canvasPattern.getContext('2d');
    canvasPattern.width = width;
    canvasPattern.height = height;
    // 创建渐变canvas
    var canvasGradient = document.createElement('canvas');
    var contextOver = canvasGradient.getContext('2d');
    canvasGradient.width = width;
    canvasGradient.height = height;
    // 绘制渐变对象
    gradient = contextOver.createLinearGradient(0, 0, 0, height);
    gradient.addColorStop(0, red);
    gradient.addColorStop(1, red);
    // 纹理对象，img指纹理图片对象
    pattern = contextUnder.createPattern(img, 'no-repeat');
    contextUnder.fillStyle = pattern;
    contextUnder.fillRect(0, 0, width, height);
    // 应用渐变
    contextOver.fillStyle = gradient;
    contextOver.fillRect(0, 0, width, height);
    // 叠加canvas
    contextOver.blendOnto(contextUnder, 'overlay');
    // 给当前context创建pattern
    pattern = context.createPattern(canvasPattern, 'no-repeat');
    // 绘制文本
    context.fillStyle = pattern;
    context.fillText('画布纹理叠加', 0, 60);
};