微信小程序上传图片

上传图片的话就做上传头像的时候遇到了，就拿上传头像举个例子吧

得知道我们都用到什么api，而且提醒一下，这个需要后端配合，因为最后需要上传到服务器

先写一下wxml吧

<view class='box' bindtap='uploadHeadImg'>上传</view>

• 其一，我们得先提示菜单：[从相册中选择，拍照]----wx.showActionSheet

uploadHeadImg: function() {
        let a = this;
        wx.showActionSheet({
            itemList: [ "从相册中选择", "拍照" ],
            itemColor: "#f7982a",
            success: function(e) {
            //album:相册   //camera拍照
                e.cancel || (0 == e.tapIndex ? a.chooseWxImageShop("album") : 1 == e.tapIndex && a.chooseWxImageShop("camera"));
            }
        });
    },

• 其二，选择照片或者拍照，返回临时路径----wx.chooseImage

//a：选择的类型  //album:相册   //camera拍照
chooseWxImageShop: function(a) {
        var e = this;
        wx.chooseImage({
            sizeType: [ "original", "compressed" ],
            sourceType: [ a ],//类型
            count:1,
            success: function(a) {
                if(a.tempFiles[0].size> 2097152){
                    wx.showModal({
                        title: "提示",
                        content: "选择的图片过大，请上传不超过2M的图片",
                        showCancel: !1,
                        success: function(a) {
                            a.confirm;
                        }
                    })
                }else{
                    //把图片上传到服务器
                    e.upload_file(a.tempFilePaths[0])
                }
            }
        });
    },

• 其三，把图片上传到服务器----wx.uploadFile

upload_file: function(e) {
    wx.showLoading({
        title: "上传中"
    });
    wx.uploadFile({
        url:url,
        filePath: e,//图片路径
        name: "user_avatar",
        formData: {
            token: a.globalData.token,
            user_avatar: "filePath"
        },
        header: {
            "Content-Type": "multipart/form-data"
        },
        success: function(a) {
            wx.hideLoading();
            wx.showToast({
                title: "上传成功",
                icon: "success",
                duration: 3000
            });
        },
        fail: function(a) {
            wx.hideLoading();
            wx.showToast({
                title: "上传失败",
                icon: "none",
                duration: 3000
            });
        }
    });
},

上传成功