etms_wechat_mini_oem/yunbainian/etms_wechat_mini/utils/util.js

const formatTime = (date) => {
    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();

    return `${[year, month, day].map(formatNumber).join("/")} ${[
    hour,
    minute,
    second,
  ]
    .map(formatNumber)
    .join(":")}`;
};

const formatNumber = (n) => {
    n = n.toString()
    return n[1] ? n : `0${n}`
};

const isDownloadFileSuccess = async (filePath) => {
    return new Promise((resolve, reject) => {
        wx.downloadFile({
            url: filePath,
            success(res) {
                if (res.statusCode === 200) {
                    resolve(true);
                } else {
                    resolve(false);
                }
            },
            fail() {
                resolve(false);
            },
        });
    });
};

const compareVersion = (v1, v2) => {
    v1 = v1.split(".");
    v2 = v2.split(".");
    const len = Math.max(v1.length, v2.length);
    while (v1.length < len) {
        v1.push("0");
    }
    while (v2.length < len) {
        v2.push("0");
    }
    for (let i = 0; i < len; i++) {
        const num1 = parseInt(v1[i], 10);
        const num2 = parseInt(v2[i], 10);

        if (num1 > num2) {
            return 1;
        } else if (num1 < num2) {
            return -1;
        }
    }

    return 0;
};

/**
 * canvas能否正常渲染图片
 * @param {string} url 图片URL
 * @param {string} canvasId 
 * @param {*} thisArg 页面实例
 * @returns 
 */
const isCreateImageSuccess = (url, canvasId, thisArg) => {
    return new Promise((resolve, reject) => {
        const {
            SDKVersion
        } = wx.getSystemInfoSync();
        const use2dCanvas = compareVersion(SDKVersion, "2.9.2") >= 0;
        if (use2dCanvas) {
            const query = thisArg.createSelectorQuery();
            query
                .select(`#${canvasId}`)
                .fields({
                    node: true,
                    size: true
                })
                .exec((res) => {
                    console.log({
                        res
                    });
                    const canvas = res[0].node;
                    const ctx = canvas.getContext("2d");
                    canvas.width = res[0].width;
                    canvas.height = res[0].height;

                    const Image = canvas.createImage();
                    Image.onload = () => {
                        ctx.drawImage(Image, 0, 0, res[0].width, res[0].height);
                        ctx.restore();
                        resolve(true);
                    };
                    Image.onerror = (e) => {
                        console.log(e);
                        resolve(false);
                    };
                    Image.src = url;
                });
        } else {
            wx.showToast({
                title: '您的微信SDK版本低，不支持该功能',
                icon: 'none', //icon
                duration: 1500 //停留时间
            })
        }
    });
};

module.exports = {
    isDownloadFileSuccess,
    compareVersion,
    isCreateImageSuccess,
    formatTime,
};