【微信小程序】微信小程序读取本地文件--学习微信小程序之路02

发布时间:2022-01-09沉默小管-技术博客微信小程序读取本地文件--学习微信小程序之路02 1503 2

原文地址: https://www.php-china.com//detail/91

# 问题描述
我想读取微信小程序本地文件，但是微信小程序好像规定要在指定的文件进行读取

# 解决流程
1.把本地文件**复制并保存**在微信小程序指定的文件
2.读取文件
```javascript
 //读取文件的路径
    //wx.env.USER_DATA_PATH微信用户数据路径
    let aFilePath = `${wx.env.USER_DATA_PATH}/data.json`

    let getFile = wx.getFileSystemManager()

    let readFileData = getFile.readFileSync(aFilePath,'utf-8')
    //读取为空
    if(!readFileData){
      //文件数据
            let jsonData = `{
  "data": [
    {
      "id": 1,
      "name": "猪肉【黑猪】",
      "originalPrice": "234",
      "curPrice": "20",
      "num":10
      "proDetail": {
        "from":"中国",
        "method":"山林低密度定制散养",
        "variety":"旧院黑鸡蛋",
        "specification":30,
        "curPrice": "20",
        "sales":8283
      },
      "addTime": "1640918029",
      "updateTime": "1640918029"
    },
    {
      "id": 2,
      "name": "猪肉【红猪】",
      "originalPrice": "47",
      "curPrice": "33",
      "num":10,
      "proDetail": {
        "from":"非洲",
        "method":"山林低密度定制散养",
        "variety":"旧院黑鸡蛋",
        "specification":30,
        "curPrice": "33",
        "sales":8533
      },
      "addTime": "1640918029",
      "updateTime": "1640918029"
    },
    {
      "id":3,
      "name": "猪肉【黄猪】",
      "originalPrice": "78",
      "curPrice": "44",
      "num":10,
      "proDetail": {
        "from":"美国",
        "method":"山林低密度定制散养",
        "variety":"旧院黑鸡蛋",
        "specification":30,
        "curPrice": "44",
        "sales":8123
      },
      "addTime": "1640918029",
      "updateTime": "1640918029"
    },
    {
      "id": 4,
      "name": "猪肉【灰猪】",
      "originalPrice": "66",
      "curPrice": "20",
      "num":10,
      "proDetail": {
        "from":"中国",
        "method":"山林低密度定制散养",
        "variety":"旧院黑鸡蛋",
        "specification":30,
        "curPrice": "20",
        "sales":863
      },
      "addTime": "1640918029",
      "updateTime": "1640918029"
    }
  ]
}
`;
      //把需要的文件复制过去并命名
      getFile.writeFileSync(aFilePath,jsonData,'utf-8')
      readFileData = getFile.readFileSync(aFilePath,'utf-8')
    }
    console.log(JSON.parse(readFileData))
```