1、調(diào)用相機(jī)或相冊上傳圖片

uni.chooseImage({
  	count: 1, // 最多可以選擇的圖片張數(shù)
    sizeType: ['original', 'compressed'], // 可以指定是原圖還是壓縮圖，默認(rèn)二者都有
    sourceType: ['camera','album'], // camera調(diào)用相機(jī)拍照，album是打開手機(jī)相冊
    success: (res)=> {
		console.log(JSON.stringify(res.tempFilePaths));
    }
})

2、圖片文件轉(zhuǎn)base64

（1）下載插件

npm i image-tools --save

（2）頁面引入插件 文章來源地址http://www.zghlxwxcb.cn/news/detail-511601.html

<template>
	<view class="container">
		<view class="upload">
			<view class="img-box" v-if="form.visitorPicture">
				<image :src="form.visitorPicture" @click="handlePreview" mode="aspectFill"></image>
				<uni-icons type="clear" class="clear" @click="form.visitorPicture = ''"></uni-icons>
			</view>
			<uni-icons type="plusempty" class="upload-box" @click="handleUpload" v-else></uni-icons>
		</view>
		<uni-icons type="right"></uni-icons>
	</view>
</template>

<script>
	import MyToast from './components/myToast.vue'
	export default {
		name: 'info',
		data() {
			return {
				form: {
					visitorPicture: ""
				}
			}
		},
		methods: {
			// 上傳頭像
			handleUpload() {
				uni.chooseImage({
					count: 1,
					sizeType: ['original', 'compressed'],
					sourceType: ['camera', 'album'],
					success: (res) => {
						uni.showLoading({
							title: '圖片上傳中'
						});
						if(res.tempFilePaths[0].split(".")[1] === "jpg" || res.tempFilePaths[0].split(".")[1] === "JPG") {
							if(res.tempFiles[0].size <= 10 * 1024 * 1024) {
								// 圖片轉(zhuǎn)為base64
								pathToBase64(res.tempFilePaths[0]).then(path => {
									this.getImageUrl(path);
								}).catch(error => {
									uni.hideLoading();
								})
							} else {
								uni.hideLoading();
								this.errorToast = "請上傳小于10MB的圖片";
								this.$refs.myToast.show();
							}
						} else {
							uni.hideLoading();
							this.errorToast = "請上傳jpg格式的圖片";
							this.$refs.myToast.show();
						}
					}
				});
			},
			// 獲取上傳到服務(wù)器圖片的在線地址
			getImageUrl(path) {
				// todo 調(diào)用接口上傳base64圖片到后端
			},
			// 圖片預(yù)覽
			handlePreview() {
				uni.previewImage({
					current: 0,
					urls: [this.form.visitorPicture]
				})
			}
		}
	}
</script>

<style lang="less" scoped>
	.upload {
		width: 100rpx;
		height: 100rpx;
		position: relative;
		.upload-box {
			width: 100% !important;
			height: 100%;
			margin-left: 0 !important;
			justify-content: center;
			border: 2rpx #DDDDDD solid;
			border-radius: 4rpx;
			box-sizing: border-box;
			position: absolute;
			top: 0;
			left: 0;
			/deep/ .uniui-plusempty {
				width: 100%;
				height: 100%;
				line-height: 96rpx;
				text-align: center;
				font-size: 40rpx !important;
				color: #CCCCCC !important;
			}
		}
		.img-box {
			width: 100%;
			height: 100%;
			position: absolute;
			top: 0;
			left: 0;
			image {
				width: 100%;
				height: 100%;
				border-radius: 4rpx;
			}
			.clear {
				width: 32rpx;
				height: 32rpx;
				position: absolute;
				right: 0;
				top: 0;
				/deep/ .uniui-clear {
					color: #7F7F7F !important;
					font-size: 32rpx !important;
				}
			}
		}
	}
</style>

3、image-tools/index.js源碼

function dataUrlToBase64(str) {
    var array = str.split(',')
    return array[array.length - 1]
}

var index = 0
function getNewFileId() {
    return Date.now() + String(index++)
}

function biggerThan(v1, v2) {
    var v1Array = v1.split('.')
    var v2Array = v2.split('.')
    var update = false
    for (var index = 0; index < v2Array.length; index++) {
        var diff = v1Array[index] - v2Array[index]
        if (diff !== 0) {
            update = diff > 0
            break
        }
    }
    return update
}

export function pathToBase64(path) {
    return new Promise(function(resolve, reject) {
        if (typeof window === 'object' && 'document' in window) {
            if (typeof FileReader === 'function') {
                var xhr = new XMLHttpRequest()
                xhr.open('GET', path, true)
                xhr.responseType = 'blob'
                xhr.onload = function() {
                    if (this.status === 200) {
                        let fileReader = new FileReader()
                        fileReader.onload = function(e) {
                            resolve(e.target.result)
                        }
                        fileReader.onerror = reject
                        fileReader.readAsDataURL(this.response)
                    }
                }
                xhr.onerror = reject
                xhr.send()
                return
            }
            var canvas = document.createElement('canvas')
            var c2x = canvas.getContext('2d')
            var img = new Image
            img.onload = function() {
                canvas.width = img.width
                canvas.height = img.height
                c2x.drawImage(img, 0, 0)
                resolve(canvas.toDataURL())
                canvas.height = canvas.width = 0
            }
            img.onerror = reject
            img.src = path
            return
        }
        if (typeof plus === 'object') {
            plus.io.resolveLocalFileSystemURL(getLocalFilePath(path), function(entry) {
                entry.file(function(file) {
                    var fileReader = new plus.io.FileReader()
                    fileReader.onload = function(data) {
                        resolve(data.target.result)
                    }
                    fileReader.onerror = function(error) {
                        reject(error)
                    }
                    fileReader.readAsDataURL(file)
                }, function(error) {
                    reject(error)
                })
            }, function(error) {
                reject(error)
            })
            return
        }
        if (typeof wx === 'object' && wx.canIUse('getFileSystemManager')) {
            wx.getFileSystemManager().readFile({
                filePath: path,
                encoding: 'base64',
                success: function(res) {
                    resolve('data:image/png;base64,' + res.data)
                },
                fail: function(error) {
                    reject(error)
                }
            })
            return
        }
        reject(new Error('not support'))
    })
}

export function base64ToPath(base64) {
    return new Promise(function(resolve, reject) {
        if (typeof window === 'object' && 'document' in window) {
            base64 = base64.split(',')
            var type = base64[0].match(/:(.*?);/)[1]
            var str = atob(base64[1])
            var n = str.length
            var array = new Uint8Array(n)
            while (n--) {
                array[n] = str.charCodeAt(n)
            }
            return resolve((window.URL || window.webkitURL).createObjectURL(new Blob([array], { type: type })))
        }
        var extName = base64.split(',')[0].match(/data\:\S+\/(\S+);/)
        if (extName) {
            extName = extName[1]
        } else {
            reject(new Error('base64 error'))
        }
        var fileName = getNewFileId() + '.' + extName
        if (typeof plus === 'object') {
            var basePath = '_doc'
            var dirPath = 'uniapp_temp'
            var filePath = basePath + '/' + dirPath + '/' + fileName
            if (!biggerThan(plus.os.name === 'Android' ? '1.9.9.80627' : '1.9.9.80472', plus.runtime.innerVersion)) {
                plus.io.resolveLocalFileSystemURL(basePath, function(entry) {
                    entry.getDirectory(dirPath, {
                        create: true,
                        exclusive: false,
                    }, function(entry) {
                        entry.getFile(fileName, {
                            create: true,
                            exclusive: false,
                        }, function(entry) {
                            entry.createWriter(function(writer) {
                                writer.onwrite = function() {
                                    resolve(filePath)
                                }
                                writer.onerror = reject
                                writer.seek(0)
                                writer.writeAsBinary(dataUrlToBase64(base64))
                            }, reject)
                        }, reject)
                    }, reject)
                }, reject)
                return
            }
            var bitmap = new plus.nativeObj.Bitmap(fileName)
            bitmap.loadBase64Data(base64, function() {
                bitmap.save(filePath, {}, function() {
                    bitmap.clear()
                    resolve(filePath)
                }, function(error) {
                    bitmap.clear()
                    reject(error)
                })
            }, function(error) {
                bitmap.clear()
                reject(error)
            })
            return
        }
        if (typeof wx === 'object' && wx.canIUse('getFileSystemManager')) {
            var filePath = wx.env.USER_DATA_PATH + '/' + fileName
            wx.getFileSystemManager().writeFile({
                filePath: filePath,
                data: dataUrlToBase64(base64),
                encoding: 'base64',
                success: function() {
                    resolve(filePath)
                },
                fail: function(error) {
                    reject(error)
                }
            })
            return
        }
        reject(new Error('not support'))
    })
}

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