APP, H5 save pictures to local

1. The APP saves the picture locally

	createImage() {
			// #ifdef H5
			this.$u.toast('H5暂不支持此功能');
			return;
			// #endif
			
			let pages = getCurrentPages();
			
			let page = pages[pages.length - 1];
			let ws = page.$getAppWebview();
			let bitmap = new plus.nativeObj.Bitmap('drawScreen');
			ws.draw(
				bitmap,
				() => {
					bitmap.save(
						'_doc/drawScreen.jpg',
						{
							overwrite: true
						},
						res => {
							
							this.picture = res.target;
							this.posterShow = true;
							bitmap.clear();
							this.$u.toast(this.posterShow,JSON.stringify(res));
						},
						error => {
							console.log(error);
							bitmap.clear();
						}
					);
				},
				error => {
					console.log(JSON.stringify(error));
					this.$u.toast(JSON.stringify(error));
				},
				{
					check: true,
					clip: {
						top: this.navigationBarHeight + this.statusBarHeight + 'px',
						left: this.left + 'px',
						width: this.windowWidth + 'px',
						height: this.windowHeight - this.statusBarHeight - this.navigationBarHeight + 'px'
					}
				}
			);
		},

downloadImage(callback) {
				// #ifdef H5
				this.$u.toast('H5暂不支持此功能')
				return;
				// #endif
				var _this = this;
				uni.saveImageToPhotosAlbum({
					filePath: _this.image_list[this.codeFlag],
					success(res) {
						console.log(res.path);
						if (callback) {
							uni.uploadFile({
								url: _this.siteBaseUrl + '/fileUploadAndDownload/upload',
								filePath: res.path,
								name: 'file',
								success: (uploadFileRes) => {
									let res = JSON.parse(uploadFileRes.data)
									_this.picture = res.data.file.url;
									callback();
								}
							});
						} else {
							_this.$u.toast('成功保存图片')
						}
					}
				})
			},

2. H5 saves the picture locally

The html2canvas used: configuration type | HTML2CANVAS Chinese documentation (allenchinese.github.io)

import html2canvas from 'html2canvas';

		createImage() {
			html2canvas(document.querySelector("#imgimg"),{useCORS: true}).then(canvas => {
				const file = document.createElement("a");
				    file.style.display = "none";
				    file.href = canvas.toDataURL("image/jpg");
				    file.download = decodeURI('文件名');
				    document.body.appendChild(file);
				    file.click();
				    document.body.removeChild(file);
			});
		},