144 lines
4.0 KiB
JavaScript
144 lines
4.0 KiB
JavaScript
export const debounce = function (func, wait = 500) {
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let timerId;
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return function (...rest) {
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if (timerId) {
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clearTimeout(timerId);
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}
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timerId = setTimeout(() => {
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func.apply(this, rest);
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}, wait);
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};
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};
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export const classNames = function (...args) {
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const hasOwn = {}.hasOwnProperty;
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const classes = [];
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args.forEach((arg) => {
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if (!arg)
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return;
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const argType = typeof arg;
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if (argType === 'string' || argType === 'number') {
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classes.push(arg);
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}
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else if (Array.isArray(arg) && arg.length) {
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const inner = classNames(...arg);
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if (inner) {
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classes.push(inner);
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}
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}
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else if (argType === 'object') {
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for (const key in arg) {
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if (hasOwn.call(arg, key) && arg[key]) {
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classes.push(key);
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}
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}
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}
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});
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return classes.join(' ');
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};
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export const styles = function (styleObj) {
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return Object.keys(styleObj)
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.map((styleKey) => `${styleKey}: ${styleObj[styleKey]}`)
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.join('; ');
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};
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export const getAnimationFrame = function (cb) {
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return wx
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.createSelectorQuery()
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.selectViewport()
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.boundingClientRect()
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.exec(() => {
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cb();
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});
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};
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export const getRect = function (context, selector) {
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return new Promise((resolve) => {
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wx.createSelectorQuery()
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.in(context)
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.select(selector)
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.boundingClientRect()
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.exec((rect = []) => resolve(rect[0]));
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});
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};
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const isDef = function (value) {
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return value !== undefined && value !== null;
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};
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export const isNumber = function (value) {
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return /^\d+(\.\d+)?$/.test(value);
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};
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export const addUnit = function (value) {
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if (!isDef(value)) {
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return undefined;
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}
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value = String(value);
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return isNumber(value) ? `${value}px` : value;
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};
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export const getCharacterLength = (type, str, max) => {
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if (!str || str.length === 0) {
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return {
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length: 0,
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characters: '',
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};
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}
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if (type === 'maxcharacter') {
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let len = 0;
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for (let i = 0; i < str.length; i += 1) {
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let currentStringLength = 0;
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if (str.charCodeAt(i) > 127 || str.charCodeAt(i) === 94) {
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currentStringLength = 2;
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}
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else {
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currentStringLength = 1;
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}
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if (len + currentStringLength > max) {
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return {
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length: len,
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characters: str.slice(0, i),
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};
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}
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len += currentStringLength;
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}
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return {
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length: len,
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characters: str,
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};
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}
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else if (type === 'maxlength') {
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const length = str.length > max ? max : str.length;
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return {
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length,
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characters: str.slice(0, length),
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};
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}
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return {
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length: str.length,
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characters: str,
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};
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};
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export const chunk = (arr, size) => Array.from({ length: Math.ceil(arr.length / size) }, (v, i) => arr.slice(i * size, i * size + size));
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export const equal = (v1, v2) => {
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if (Array.isArray(v1) && Array.isArray(v2)) {
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if (v1.length !== v2.length)
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return false;
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return v1.every((item, index) => equal(item, v2[index]));
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}
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return v1 === v2;
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};
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export const clone = (val) => {
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if (Array.isArray(val)) {
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return val.map((item) => clone(item));
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}
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return val;
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};
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export const getInstance = function (context, selector) {
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if (!context) {
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const pages = getCurrentPages();
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const page = pages[pages.length - 1];
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context = page.$$basePage || page;
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}
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const instance = context ? context.selectComponent(selector) : null;
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if (!instance) {
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console.warn('未找到组件,请检查selector是否正确');
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return null;
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}
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return instance;
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};
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