122 lines
3.2 KiB
JavaScript
122 lines
3.2 KiB
JavaScript
const formatTime = (date) => {
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const year = date.getFullYear();
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const month = date.getMonth() + 1;
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const day = date.getDate();
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const hour = date.getHours();
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const minute = date.getMinutes();
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const second = date.getSeconds();
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return `${[year, month, day].map(formatNumber).join("/")} ${[
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hour,
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minute,
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second,
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]
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.map(formatNumber)
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.join(":")}`;
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};
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const formatNumber = (n) => {
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n = n.toString()
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return n[1] ? n : `0${n}`
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};
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const isDownloadFileSuccess = async (filePath) => {
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return new Promise((resolve, reject) => {
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wx.downloadFile({
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url: filePath,
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success(res) {
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if (res.statusCode === 200) {
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resolve(true);
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} else {
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resolve(false);
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}
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},
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fail() {
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resolve(false);
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},
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});
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});
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};
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const compareVersion = (v1, v2) => {
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v1 = v1.split(".");
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v2 = v2.split(".");
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const len = Math.max(v1.length, v2.length);
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while (v1.length < len) {
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v1.push("0");
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}
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while (v2.length < len) {
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v2.push("0");
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}
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for (let i = 0; i < len; i++) {
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const num1 = parseInt(v1[i], 10);
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const num2 = parseInt(v2[i], 10);
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if (num1 > num2) {
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return 1;
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} else if (num1 < num2) {
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return -1;
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}
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}
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return 0;
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};
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/**
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* canvas能否正常渲染图片
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* @param {string} url 图片URL
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* @param {string} canvasId
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* @param {*} thisArg 页面实例
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* @returns
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*/
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const isCreateImageSuccess = (url, canvasId, thisArg) => {
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return new Promise((resolve, reject) => {
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const {
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SDKVersion
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} = wx.getSystemInfoSync();
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const use2dCanvas = compareVersion(SDKVersion, "2.9.2") >= 0;
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if (use2dCanvas) {
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const query = thisArg.createSelectorQuery();
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query
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.select(`#${canvasId}`)
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.fields({
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node: true,
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size: true
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})
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.exec((res) => {
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console.log({
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res
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});
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const canvas = res[0].node;
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const ctx = canvas.getContext("2d");
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canvas.width = res[0].width;
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canvas.height = res[0].height;
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const Image = canvas.createImage();
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Image.onload = () => {
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ctx.drawImage(Image, 0, 0, res[0].width, res[0].height);
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ctx.restore();
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resolve(true);
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};
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Image.onerror = (e) => {
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console.log(e);
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resolve(false);
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};
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Image.src = url;
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});
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} else {
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wx.showToast({
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title: '您的微信SDK版本低，不支持该功能',
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icon: 'none', //icon
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duration: 1500 //停留时间
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})
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}
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});
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};
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module.exports = {
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isDownloadFileSuccess,
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compareVersion,
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isCreateImageSuccess,
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formatTime,
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}; |