html页面：
<eui-linkbutton iconCls="fa fa-arrow-circle-down" btnCls="linked-btn" (click)='downloadFile(fileUrl, fileName)'>下载</eui-linkbutton>
JS端：
// 图片下载
downloadFile(fileUrl: any, fileName: any) {
if ( this.downImagePath === '' || this.downImagePath === null) {
super.alert('请选中一张照片进行下载');
return;
}
fileUrl = this.downImagePath;
fileName = this.downImagePath;
// 获取文件扩展名
const index = fileUrl.lastIndexOf('.');
const fileExtension = fileUrl.substring(index + 1, fileUrl.length);
// 图片下载
downloadFile(fileUrl: any, fileName: any) {
if ( this.downImagePath === '' || this.downImagePath === null) {
super.alert('请选中一张照片进行下载');
return;
}
fileUrl = this.downImagePath;
fileName = this.downImagePath;
// 获取文件扩展名
const index = fileUrl.lastIndexOf('.');
const fileExtension = fileUrl.substring(index + 1, fileUrl.length);
// 图片下载
if (/^image[jpeg|jpg|png|gif]/.test(fileExtension)) {
const image = new Image();
// 解决跨域 Canvas 污染问题
image.setAttribute('crossOrigin', 'anonymous');
image.onload = () => {
const canvas = document.createElement('canvas');
canvas.width = image.width;
canvas.height = image.height;
const context = canvas.getContext('2d');
context.drawImage(image, 0, 0, image.width, image.height);
const url = canvas.toDataURL(fileUrl); // 得到图片的base64编码数据
const a = document.createElement('a'); // 生成一个a元素
const event = new MouseEvent('click'); // 创建一个单击事件
a.download = fileName || 'photo'; // 设置图片名称
a.href = url; // 将生成的URL设置为a.href属性
a.dispatchEvent(event); // 触发a的单击事件
};
image.src = fileUrl;
} else {
const elemIF = document.createElement('iframe');
elemIF.src = fileUrl;
elemIF.style.display = 'none';
document.body.appendChild(elemIF);
setTimeout(() => {
document.body.removeChild(elemIF);
}, 1000);
}
}