微信小程序上传图片

<view class="weui-cells uploader-wrap">
            <view class="uploader-text">添加图片</view>
            <view class="weui-uploader">
                <view class="weui-uploader__bd">
                    <view class="weui-uploader__files" id="uploaderFiles">
                        <block wx:for-items="{{files}}" wx:key="{{index}}">
                            <view class="weui-uploader__file" bindtap="previewImage" id="{{item}}">
                                <image class="weui-uploader__img" src="{{item}}" mode="aspectFill" />
                            </view>
                        </block>
                    </view>
                    <view class="weui-uploader__input-box" wx:if="{{files.length <= 0}}">
                        <view class="weui-uploader__input" bindtap="chooseImage"></view>
                    </view>
                </view>
            </view>
        </view>

Page({
    data: {
        files: []
    },
    chooseImage: function (e) {
        var that = this;
        wx.chooseImage({
            sizeType: ['original', 'compressed'], // 可以指定是原图还是压缩图，默认二者都有
            sourceType: ['album', 'camera'], // 可以指定来源是相册还是相机，默认二者都有
            count: 1, // 最多可以选择的图片张数
            success: function (res) {
                // 返回选定照片的本地文件路径列表，tempFilePath可以作为img标签的src属性显示图片
                that.setData({
                    files: that.data.files.concat(res.tempFilePaths)
                });
            }
        })
    },
    previewImage: function(e){
        wx.previewImage({
            current: e.currentTarget.id, // 当前显示图片的http链接
            urls: this.data.files // 需要预览的图片http链接列表
        })
    }
})

@import 'style/weui.wxss';

.uploader-wrap {
    width: 100%;
    overflow: hidden;
}
.uploader-text {
    float: left;
    height: 98px;
    line-height: 98px;
    padding-left: 15px;
    margin-right: 20px;
}
.weui-uploader {
    float: left;
    padding-top: 9px;
}