VUE知识点小记
.if里面不能用import方式导入,只能用require方式引入
判断长度大于0
getIssues (vue, data) { let label = '' if (data.label && data.label.trim().length > 0) { label = `+label:"${data.label}"` }
es6中使用Number.isInteger()用来判断一个值是否为整数。
在html将显示时间格式化:
<span class="time">{{$moment(comment.created_at).format('YYYY-MM-DD HH:mm')}}</span>
回到主页
this.$router.push('/')
<span @click="openThirdPartySite('https://github.com/bingoogolapple/BGAIssueBlog')">BGAIssueBlog</span> openThirdPartySite (url) { window.open(url) } visitRoute(r) { this.$router.push(r) } <el-table-column prop="sex" label="性别" width="100" :formatter="formatSex" sortable> </el-table-column> //性别显示转换 formatSex: function (row, column) { return row.sex == 1 ? '男' : row.sex == 0 ? '女' : '未知'; }, return context == null || context == "" || context == "undefined" ? "" : context;
判断指定用户名
export function validUsername(str) { const valid_map = ['admin', 'editor'] return valid_map.indexOf(str.trim()) >= 0 }
/** * @param {string} str * @returns {Boolean} */ export function isString(str) { if (typeof str === 'string' || str instanceof String) { return true } return false } /** * @param {Array} arg * @returns {Boolean} */ export function isArray(arg) { if (typeof Array.isArray === 'undefined') { return Object.prototype.toString.call(arg) === '[object Array]' } return Array.isArray(arg) }
utils:
/** * Created by PanJiaChen on 16/11/18. */ /** * Parse the time to string * @param {(Object|string|number)} time * @param {string} cFormat * @returns {string} */ export function parseTime(time, cFormat) { if (arguments.length === 0) { return null } const format = cFormat || '{y}-{m}-{d} {h}:{i}:{s}' let date if (typeof time === 'object') { date = time } else { if ((typeof time === 'string') && (/^[0-9]+$/.test(time))) { time = parseInt(time) } if ((typeof time === 'number') && (time.toString().length === 10)) { time = time * 1000 } date = new Date(time) } const formatObj = { y: date.getFullYear(), m: date.getMonth() + 1, d: date.getDate(), h: date.getHours(), i: date.getMinutes(), s: date.getSeconds(), a: date.getDay() } const time_str = format.replace(/{(y|m|d|h|i|s|a)+}/g, (result, key) => { let value = formatObj[key] // Note: getDay() returns 0 on Sunday if (key === 'a') { return ['日', '一', '二', '三', '四', '五', '六'][value ] } if (result.length > 0 && value < 10) { value = '0' + value } return value || 0 }) return time_str } /** * @param {number} time * @param {string} option * @returns {string} */ export function formatTime(time, option) { if (('' + time).length === 10) { time = parseInt(time) * 1000 } else { time = +time } const d = new Date(time) const now = Date.now() const diff = (now - d) / 1000 if (diff < 30) { return '刚刚' } else if (diff < 3600) { // less 1 hour return Math.ceil(diff / 60) + '分钟前' } else if (diff < 3600 * 24) { return Math.ceil(diff / 3600) + '小时前' } else if (diff < 3600 * 24 * 2) { return '1天前' } if (option) { return parseTime(time, option) } else { return ( d.getMonth() + 1 + '月' + d.getDate() + '日' + d.getHours() + '时' + d.getMinutes() + '分' ) } } /** * @param {string} url * @returns {Object} */ export function getQueryObject(url) { url = url == null ? window.location.href : url const search = url.substring(url.lastIndexOf('?') + 1) const obj = {} const reg = /([^?&=]+)=([^?&=]*)/g search.replace(reg, (rs, $1, $2) => { const name = decodeURIComponent($1) let val = decodeURIComponent($2) val = String(val) obj[name] = val return rs }) return obj } /** * @param {string} input value * @returns {number} output value */ export function byteLength(str) { // returns the byte length of an utf8 string let s = str.length for (var i = str.length - 1; i >= 0; i--) { const code = str.charCodeAt(i) if (code > 0x7f && code <= 0x7ff) s++ else if (code > 0x7ff && code <= 0xffff) s += 2 if (code >= 0xDC00 && code <= 0xDFFF) i-- } return s } /** * @param {Array} actual * @returns {Array} */ export function cleanArray(actual) { const newArray = [] for (let i = 0; i < actual.length; i++) { if (actual[i]) { newArray.push(actual[i]) } } return newArray } /** * @param {Object} json * @returns {Array} */ export function param(json) { if (!json) return '' return cleanArray( Object.keys(json).map(key => { if (json[key] === undefined) return '' return encodeURIComponent(key) + '=' + encodeURIComponent(json[key]) }) ).join('&') } /** * @param {string} url * @returns {Object} */ export function param2Obj(url) { const search = url.split('?')[1] if (!search) { return {} } return JSON.parse( '{"' + decodeURIComponent(search) .replace(/"/g, '\\"') .replace(/&/g, '","') .replace(/=/g, '":"') .replace(/\+/g, ' ') + '"}' ) } /** * @param {string} val * @returns {string} */ export function html2Text(val) { const div = document.createElement('div') div.innerHTML = val return div.textContent || div.innerText } /** * Merges two objects, giving the last one precedence * @param {Object} target * @param {(Object|Array)} source * @returns {Object} */ export function objectMerge(target, source) { if (typeof target !== 'object') { target = {} } if (Array.isArray(source)) { return source.slice() } Object.keys(source).forEach(property => { const sourceProperty = source[property] if (typeof sourceProperty === 'object') { target[property] = objectMerge(target[property], sourceProperty) } else { target[property] = sourceProperty } }) return target } /** * @param {HTMLElement} element * @param {string} className */ export function toggleClass(element, className) { if (!element || !className) { return } let classString = element.className const nameIndex = classString.indexOf(className) if (nameIndex === -1) { classString += '' + className } else { classString = classString.substr(0, nameIndex) + classString.substr(nameIndex + className.length) } element.className = classString } /** * @param {string} type * @returns {Date} */ export function getTime(type) { if (type === 'start') { return new Date().getTime() - 3600 * 1000 * 24 * 90 } else { return new Date(new Date().toDateString()) } } /** * @param {Function} func * @param {number} wait * @param {boolean} immediate * @return {*} */ export function debounce(func, wait, immediate) { let timeout, args, context, timestamp, result const later = function() { // 据上一次触发时间间隔 const last = +new Date() - timestamp // 上次被包装函数被调用时间间隔 last 小于设定时间间隔 wait if (last < wait && last > 0) { timeout = setTimeout(later, wait - last) } else { timeout = null // 如果设定为immediate===true,因为开始边界已经调用过了此处无需调用 if (!immediate) { result = func.apply(context, args) if (!timeout) context = args = null } } } return function(...args) { context = this timestamp = +new Date() const callNow = immediate && !timeout // 如果延时不存在,重新设定延时 if (!timeout) timeout = setTimeout(later, wait) if (callNow) { result = func.apply(context, args) context = args = null } return result } } /** * This is just a simple version of deep copy * Has a lot of edge cases bug * If you want to use a perfect deep copy, use lodash's _.cloneDeep * @param {Object} source * @returns {Object} */ export function deepClone(source) { if (!source && typeof source !== 'object') { throw new Error('error arguments', 'deepClone') } const targetObj = source.constructor === Array ? [] : {} Object.keys(source).forEach(keys => { if (source[keys] && typeof source[keys] === 'object') { targetObj[keys] = deepClone(source[keys]) } else { targetObj[keys] = source[keys] } }) return targetObj } /** * @param {Array} arr * @returns {Array} */ export function uniqueArr(arr) { return Array.from(new Set(arr)) } /** * @returns {string} */ export function createUniqueString() { const timestamp = +new Date() + '' const randomNum = parseInt((1 + Math.random()) * 65536) + '' return (+(randomNum + timestamp)).toString(32) } /** * Check if an element has a class * @param {HTMLElement} elm * @param {string} cls * @returns {boolean} */ export function hasClass(ele, cls) { return !!ele.className.match(new RegExp('(\\s|^)' + cls + '(\\s|$)')) } /** * Add class to element * @param {HTMLElement} elm * @param {string} cls */ export function addClass(ele, cls) { if (!hasClass(ele, cls)) ele.className += ' ' + cls } /** * Remove class from element * @param {HTMLElement} elm * @param {string} cls */ export function removeClass(ele, cls) { if (hasClass(ele, cls)) { const reg = new RegExp('(\\s|^)' + cls + '(\\s|$)') ele.className = ele.className.replace(reg, ' ') } }
https://github.com/PanJiaChen/vue-element-admin.git
此随笔或为自己所写、或为转载于网络。仅用于个人收集及备忘。