我們要通過canvas繪圖和a標籤的download屬性來實現點擊保存圖片
示例:
HTML部分:
<div class="btn" @click="saveImg">保存海報</div>
js部分:
downloadIamge: function(imgsrc, name) {
let image = new Image();
image.setAttribute("crossOrigin", "anonymous");
image.onload = function() {
let canvas = document.createElement("canvas");
canvas.width = image.width;
canvas.height = image.height;
let context = canvas.getContext("2d");
context.drawImage(image, 0, 0, image.width, image.height);
let url = canvas.toDataURL("image/png"); //得到圖片的base64編碼數據
let a = document.createElement("a"); // 生成一個a元素
let event = new MouseEvent("click"); // 創建一個單擊事件
a.download = name || "海報"; // 設置圖片名稱沒有設置則爲默認
a.href = url; // 將生成的URL設置爲a.href屬性
a.dispatchEvent(event); // 觸發a的單擊事件
};
image.src = imgsrc;
},
saveImg: function() {
this.downloadIamge(圖片地址, 圖片名稱);
}