lachang-wxapp/utils/util.js

const api = require('../request/api');
const http = require('../request/http.js');
const storeKeys = require('./storageKeys');

/**
 * 工具类
 */
module.exports = {

  // 提示
  toast(text, time = 1500) {
    wx.showToast({
      title: text,
      icon: 'none',
      duration: time
    })
  },

  //重置缓存
  setStorageSync(key, value) {
    wx.setStorageSync(key, value)
  },

  //获取缓存
  getStorageSync(key) {
    try {
      let value = wx.getStorageSync(key) || "";
      return value;
    } catch (e) {
      return "";
    }
  },

  //删除缓存
  removeStorageSync(key) {
    wx.removeStorageSync(key);
  },

  // 防抖
  throttle: function (fn, gapTime) {
    if (gapTime == null || gapTime == undefined) {
      gapTime = 1000;
    }
    let _lastTime = null;
    return function () {
      let _nowTime = +new Date()
      if (_nowTime - _lastTime > gapTime || !_lastTime) {
        fn.apply(this, arguments);
        _lastTime = _nowTime;
      }
    }
  },

  //scene解码
  scene_decode(e) {
    if (e === undefined)
      return {};
    let scene = decodeURIComponent(e),
      params = scene.split(','),
      data = {};
    for (let i in params) {
      let val = params[i].split(':');
      val.length > 0 && val[0] && (data[val[0]] = val[1] || null)
    }
    return data;
  },

  //格式化日期格式 (用于兼容ios Date对象)
  format_date(time) {
    // 将xxxx-xx-xx的时间格式，转换为 xxxx/xx/xx的格式 
    return time.replace(/\-/g, "/");
  },

  //对象转URL
  urlEncode(data) {
    var _result = [];
    for (var key in data) {
      var value = data[key];
      if (value.constructor == Array) {
        value.forEach(_value => {
          _result.push(key + "=" + _value);
        });
      } else {
        _result.push(key + '=' + value);
      }
    }
    return _result.join('&');
  },

  //遍历对象
  objForEach(obj, callback) {
    Object.keys(obj).forEach((key) => {
      callback(obj[key], key);
    });
  },

  //是否在数组内
  inArray(search, array) {
    for (var i in array) {
      if (array[i] == search) {
        return true;
      }
    }
    return false;
  },
  // canvas，文字，x，y，最大宽，行高，行数，字体样式
  canvasWraptitleText(canvas, text, x, y, maxWidth, lineHeight, maxRowNum, font) {
    if (typeof text != 'string' || typeof x != 'number' || typeof y != 'number') {
      return;
    }
    canvas.font = font;
    let arrText = text.split('');
    let line = '';
    let rowNum = 1
    for (let n = 0; n < arrText.length; n++) {
      let testLine = line + arrText[n];
      let metrics = canvas.measureText(testLine);
      let testWidth = metrics.width;
      if (testWidth > maxWidth && n > 0) {
        if (rowNum >= maxRowNum) {
          let arrLine = testLine.split('')
          arrLine.splice(-2)
          let newTestLine = arrLine.join("")
          newTestLine += "..."
          canvas.fillText(newTestLine, x, y);
          return
        }
        canvas.fillText(line, x, y);
        line = arrText[n];
        y += lineHeight;
        rowNum += 1
      } else {
        line = testLine;
      }
    }
    canvas.fillText(line, x, y);
  },
  //设定宽 设定高 图片本身宽 图片本身高
  getSXYWH(cW, cH, iW, iH) {
    let width = cW; //设定宽
    let height = cH; //设定高
    let w = iW; //图片本身宽
    let h = iH; //图片本身高
    let dw = width / w; //宽比例
    let dh = height / h; //高比例
    let sX; //裁剪偏移X
    let sY; //裁剪偏移Y
    let sW; //裁剪宽
    let sH; //裁剪高

    // 裁剪图片中间部分
    if (w > width && h > height || w < width && h < height) {
      if (dw > dh) {
        sX = 0;
        sY = (h - height / dw) / 2;
        sW = w
        sH = height / dw
      } else {
        sX = (w - width / dh) / 2;
        sY = 0;
        sW = width / dh
        sH = h
      }
    } else { // 拉伸图片
      if (w < width) {
        sX = 0
        sY = (h - height / dw) / 2;
        sW = w
        sH = height / dw
      } else {
        sX = (w - width / dh) / 2;
        sY = 0;
        sW = width / dh
        sH = h
      }
    }

    let returnData = {
      sX,
      sY,
      sW,
      sH
    };
    return returnData
  },
  //事件防抖
  throttle: function(fn, gapTime) {
    if (gapTime == null || gapTime == undefined) {gapTime = 1000;}
    let _lastTime = null;
    return function () {
        let _nowTime = + new Date()
        if (_nowTime - _lastTime > gapTime || !_lastTime) {
            fn.apply(this, arguments);
            _lastTime = _nowTime;
        }
    }
  },
  //禁止金额输入多个小数点
  money(param) {
    let num = param.toString(); //先转换成字符串类型
    if (num.indexOf('.') == 0) { //第一位就是 .
      num = '0' + num
    }
    num = num.replace(/[^\d.]/g, ""); //清除“数字”和“.”以外的字符
    num = num.replace(/\.{2,}/g, "."); //只保留第一个. 清除多余的
    num = num.replace(".", "$#$").replace(/\./g, "").replace("$#$", ".");
    num = num.replace(/^(\-)*(\d+)\.(\d\d).*$/, '$1$2.$3'); //只能输入两个小数
    if (num.indexOf(".") < 0 && num != "") {
      num = parseFloat(num);
    }
    return num
  },
  //获取当前时间
  formatTime(date,type){
    const year = date.getFullYear()
    const month = date.getMonth() + 1
    const day = date.getDate()
    const hour = date.getHours()
    const minute = date.getMinutes()
    const second = date.getSeconds()
    // 1:  2021-10-10 10:10:10
    let joinType = "/";
    if(type == 1){
      joinType = "-"
    }
    return [year, month, day].map(this.formatNumber).join(joinType) + ' ' + [hour, minute, second].map(this.formatNumber).join(':')
  },
  // 时间格式化输出  day--天  hours--时  minutes--分  seconds--秒
  dateForma(micro_second,type) {
    let second = Math.floor(micro_second / 1000);
    let value;
    switch(type) {
      case "day":
         value = Math.floor(second / 3600 / 24);
         break;
      case "hours":
         value =  this.formatNumber(Math.floor(second / 3600 % 24));
         break;
      case "minutes":
         value = this.formatNumber(Math.floor(second / 60 % 60));
         break;
      case "seconds":
         value = this.formatNumber(Math.floor(second % 60));
         break;
      } 
    return value;
   },
   newDateForma(micro_second,type) {
    let second = micro_second;
    let value;
    switch(type) {
      case "day":
         value = Math.floor(second / 3600 / 24);
         break;
      case "hours":
         value =  this.formatNumber(Math.floor(second / 3600 % 24));
         break;
      case "minutes":
         value = this.formatNumber(Math.floor(second / 60 % 60));
         break;
      case "seconds":
         value = this.formatNumber(Math.floor(second % 60));
         break;
      } 
    return value;
   },
  formatNumber(n){
    n = n.toString()
    return n[1] ? n : '0' + n
  },

  toDecimal2(x) {
    var f = parseFloat(x);
    if (isNaN(f)) {
        return "";
    }
    var f = Math.round(x*100)/100;
    var s = f.toString();
    var rs = s.indexOf('.');
    if (rs < 0) {
        rs = s.length;
        s += '.';
    }
    while (s.length <= rs + 2) {
        s += '0';
    }
    return s;
}
};