| 本文实例为大家分享了canvas实现九宫格切图效果的具体代码，供大家参考，具体内容如下 首先页面展示 
直接上代码 <!DOCTYPE html><html lang="en"><head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <meta http-equiv="X-UA-Compatible" content="ie=edge"> <title>Document</title> <style> body { text-align: center; } canvas { border: 1px solid; } .newcanvas { width: 316px; height: 316px; margin: auto; } .newpohoto, .download { width: 300px; height: 40px; line-height: 40px; margin: auto; background-color: cornflowerblue; border-radius: 5px; cursor: pointer; margin: 10px auto; color: white; } </style></head><body> <h3>使用canvas实现九宫格切图的效果</h3> <div class="mycanvas"> <canvas width="300" height="300" id="mycnavas"></canvas> </div> <div class="newpohoto"> 开始切图 </div> <div class="newcanvas"> <canvas width="100" height="100" id="img1"></canvas> <canvas width="100" height="100" id="img2"></canvas> <canvas width="100" height="100" id="img3"></canvas> <canvas width="100" height="100" id="img4"></canvas> <canvas width="100" height="100" id="img5"></canvas> <canvas width="100" height="100" id="img6"></canvas> <canvas width="100" height="100" id="img7"></canvas> <canvas width="100" height="100" id="img8"></canvas> <canvas width="100" height="100" id="img9"></canvas> </div> <div class="download"> 下载图片 </div> <script> var canvas = document.getElementById("mycnavas"); //现将图片放上去 var cxt = mycnavas.getContext("2d"); var img = new Image(); img.src = "../img/img10.jpg"; window.onload = function() { cxt.drawImage(img, 0, 0, 400, 300); //画好图片的位置 } var arr = []; //将切的图片存到数组里面 document.getElementsByClassName("newpohoto")[0].onclick = function() { var q = 1; for (var i = 0; i < 3; i++) { for (var j = 0; j < 3; j++) { var data = cxt.getImageData(j * 100, i * 100, 400, 100); //类似于“复制”功能 var img = document.getElementById("img" + q) var newcxt = img.getContext("2d"); newcxt.putImageData(data, 0, 0); //类似“粘贴”功能 arr.push(console.log(img.toDataURL(q + ".png"))) //toDataURL()方法的两个参数：DataURL(type, encoderOptions) type指定转换为base64编码后图片的格式，如：image/png、image/jpeg、image/webp等等，默认为image/png格式； q++; console.log(arr) } } } //下载切的图片 var arr = []; document.getElementsByClassName('download')[0].onclick = function() { for (var i = 0; i < 9; i++) { var a = document.createElement('a'); a.download = 'img' + (i + 1); a.href = arr[i]; document.body.appendChild(a); a.click(); } } </script></body></html>以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持wanshiok.com。
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