实际项目开发中常用js工具函数总结

        这篇总结纯粹作为本人在项目中复制的来源，会在代码块中陆续添加方法，也欢迎各位读者朋友将项目开发中常用的函数分享给在下。

1.
// 深拷贝
function cloneObj(obj) {
  var newObj = {}
  if (obj instanceof Array) {
    newObj = []
  }
  for (var key in obj) {
    var val = obj[key]
    newObj[key] = typeof val === 'object' ? cloneObj(val) : val
  }
  return newObj
}

2.
/**
 * 将一位数组递归成树 根据id和pid
 * @param {*} data 树原始一维数据
 * @returns 
 */
function generateTree(data) {
    let results = []
    data.forEach((node) => {
        if (!node.parentId) {
            results.push({
                children: [],
                ...node
            })
        }
    })

    function recursionData(rootArr, sourceArr) {
        rootArr.forEach((root) => {
            root.children = sourceArr.filter((source) => {
                return root.id === source.pId
            })
            if (root.children.length > 0) {
                recursionData(root.children, sourceArr)
            }
        })
    }
    recursionData(results, data)
    return results
}

3.
/**
 * request interceptor 给接口请求添加token
 * @param {*} getToken函数为获取token的方法，自行封装
 * @returns 
 */
axios.interceptors.request.use(
  config => {
    // 除login接口外其余接口需要将token和userId放到header中
    if (getToken()) {
      config.headers['Authorization'] = getToken();
      // config.headers['userId'] = getUserId();
      if (config.method === 'get') {
        config.params = Object.assign({}, config.params, {
          '_t': new Date().valueOf()
        })
      }
    }
    // config.headers['userId'] = 1;
    return config;
  },
  error => {
    console.log(error); // for debug
    return Promise.reject(error);
  }
);

4.
/**
 * response interceptor axios接口返回错误处理 
 * @param {*} Message函数为element-ui的Message模块
 * @returns 
 */
axios.interceptors.response.use(
  /**
   * If you want to get http information such as headers or status
   * Please return  response => response
   */

  /**
   * Determine the request status by custom code
   * Here is just an example
   * You can also judge the status by HTTP Status Code
   */
  response => {
    return response
  },
  error => {
    if (error.response) {
      switch (error.response.status) {
        case 401:
          router.replace({
            path: "/login"
            // query: { redirect: router.currentRoute.fullPath }
          });
          break;
        case 403:
          Message({
            type: "error",
            message: "暂无权限",
            duration: 3000
          });
          break;
        case 500:
          if (error.response.data.message) {
            Message({
              type: "error",
              message: error.response.data.message,
              duration: 3000
            });
          } else {
            Message({
              type: "error",
              message: "接口调用失败，服务端有异常!",
              duration: 3000
            });
          }
          break;
        case 501:
          Message({
            type: "error",
            message: "接口调用失败，服务端有异常!",
            duration: 3000
          });
          break;
        case 502:
          Message({
            type: "error",
            message: "网络异常",
            duration: 3000
          });
          break;
        case 503:
          Message({
            type: "error",
            message: "网络异常",
            duration: 3000
          });
          break;
      }
    }

    return Promise.reject(error);
  }
);

/* 手机号码或者电话号码验证 */
  validatephone: (rule, value, callback) => {
    let mobile = /^1[3|5|7|8]\d{9}$/
    let phone = /^0\d{2,3}-?\d{7,8}$/
    let format = mobile.test(value) || phone.test(value)
    if (!format) {
      callback(new Error('请输入正确号码'))
    } else {
      callback()
    }
  },
  /*多邮箱，以;分割*/
  validateManyMail: (rule, value, cb) => {
    let mailReg = /^((([a-z0-9_\.-]+)@([\da-z\.-]+)\.([a-z\.]{2,6}\;))*(([a-z0-9_\.-]+)@([\da-z\.-]+)\.([a-z\.]{2,6})))$/
    if (!value) {
      cb()
    } else if (!mailReg.test(value)) {
      cb(new Error('邮箱格式不正确'))
    } else {
      cb()
    }
  }

/*时间格式*/
export function dateFormat (date) {
  const curDate = new Date(date)
  const year = curDate.getFullYear()
  let month = curDate.getMonth() + 1
  let day = curDate.getDate()
  const hours = curDate.getHours()
  const minute = curDate.getMinutes()
  const seconds = curDate.getSeconds()
  month = month.toString().length < 2 ? `0${month}` : month
  day = day.toString().length < 2 ? `0${day}` : day
  return {
    year,
    month,
    day,
    hours,
    minute,
    seconds
  }
}

/**
             * 判断文件是否是图片
             */
            judgeISImage(item) {
                var FileExt = item.files[0].fileName.replace(/.+\./, "");
                if (['jpg','jpeg','bmp','png','gif'].indexOf(FileExt.toLowerCase()) === -1){
                    return false;
                }else{
                    return true;
                }
            }