yinchuan-community-all/mini-program/garden-wxapp/utils/util.js

import simpleCache from './cache.js'
import dateTime from './dateTime.js'
//工具类
let util = {}

//预览图片
// this.$util.preview('http://....png')
// this.$util.preview('../../test.png')
// this.$util.preview(['http://....png', '../../test.png'])
util.preview = async (src) => {
    const urls = typeof src === 'string' ? [src] : src
    const filePath = async src => src.match(/^http/) ? src : (await uni.compressImage({
        src,
        quality: 100
    }))[1].tempFilePath
    for (let i = 0; i < urls.length; i++) {
        urls[i] = await filePath(urls[i])
    }
    uni.previewImage({urls})
},

//复制
    util.copy = content => {
        uni.setClipboardData({data: content});
    }

util.calculateDistance = (lat1, lng1, lat2, lng2) => {
    console.log(lat1, lng1, lat2, lng2)
    var radLat1 = lat1 * Math.PI / 180.0;
    var radLat2 = lat2 * Math.PI / 180.0;
    var a = radLat1 - radLat2;
    var b = lng1 * Math.PI / 180.0 - lng2 * Math.PI / 180.0;
    var s = 2 * Math.asin(Math.sqrt(Math.pow(Math.sin(a / 2), 2) +
        Math.cos(radLat1) * Math.cos(radLat2) * Math.pow(Math.sin(b / 2), 2)));
    s = s * 6378.137;
    s = Math.round(s * 10000) / 10;//单位米
    return s
},


    util.showModal = (content, title = '提示') => {
        return new Promise((resolve, reject) => {
            uni.showModal({
                title: title,
                content: content,
                success: (res) => {
                    resolve(res)
                }
            });
        })
    }

//拨打电话
util.callPhone = (phone) => {
    uni.showModal({
        title: '提示',
        content: `确定要拨打电话：${phone}吗?`,
        success: function (res) {
            if (res.confirm) {
                uni.makePhoneCall({
                    phoneNumber: phone //仅为示例
                });
            }
        }
    });
}

//四舍五入保留2位小数（不够位数，则用0替补）
util.keepTwoDecimalFull = num => {
    var result = parseFloat(num)
    if (isNaN(result)) {
        return false
    }
    result = Math.round(num * 100) / 100
    var s_x = result.toString()
    var pos_decimal = s_x.indexOf('.')
    if (pos_decimal < 0) {
        pos_decimal = s_x.length
        s_x += '.'
    }
    while (s_x.length <= pos_decimal + 2) {
        s_x += '0'
    }
    return s_x
}

/**
 * 数组去重
 * @param {Array} arr 源数组
 *
 * @return {Array} newArr 去重后的数组
 */
util.uniqueArray = (arr) => {
    return [...new Set(arr)]
}


//获取某一个页面上下文 context
util.getPageCtx = (idx = 0) => {
    let pages = getCurrentPages()
    if (pages.length > 0) {
        return pages[pages.length - 1 - idx] || {}
    }
    return {}
}

//获取当前页面路由
util.getCurrentRoute = () => {
    let page = util.getPageCtx()
    if (page.route) {
        return page.route
    }
    return ''
}

//回到上一页刷新页面
util.isReloadAndBack = () => {
    let prePage = util.getPageCtx(1)
    prePage.setData({
        "reload": true
    })
    uni.navigateBack({
        delta: 1
    })
}
//onshow方法通过刷新mescroll数据
util.reload = (mescroll) => {
    let page = util.getPageCtx()
    if (page.data.reload) {
        mescroll.resetUpScroll();
        page.data.reload = false
    }
}


export default util