if (‘getContext‘ in document.createElement(‘canvas‘)) { HTMLImageElement.prototype.play = function() { if (this.storeCanvas) { // 移除存储的canvas this.storeCanvas.parentElement.removeChild(this.storeCanvas); this.storeCanvas = null; // 透明度还原 image.style.opacity = ‘‘; } if (this.storeUrl) { this.src = this.storeUrl; } }; HTMLImageElement.prototype.stop = function() { var canvas = document.createElement(‘canvas‘); // 尺寸 var width = this.width, height = this.height; if (width && height) { // 存储之前的地址 if (!this.storeUrl) { this.storeUrl = this.src; } // canvas大小 canvas.width = width; canvas.height = height; // 绘制图片帧(第一帧) canvas.getContext(‘2d‘).drawImage(this, 0, 0, width, height); // 重置当前图片 try { this.src = canvas.toDataURL("image/gif"); } catch(e) { // 跨域 this.removeAttribute(‘src‘); // 载入canvas元素 canvas.style.position = ‘absolute‘; // 前面插入图片 this.parentElement.insertBefore(canvas, this); // 隐藏原图 this.style.opacity = ‘0‘; // 存储canvas this.storeCanvas = canvas; } } }; }
var image = document.getElementsByTagName("img")[0]; // 停止gif图片 image.stop(); // 播放gif图片 image.play();
时间: 2024-11-06 07:35:47