js帮助utils.js

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//超出指定长度后，使用...替换 export const formatEllipsis = (str = "", limitLen = 24) => {     if (str.length >= limitLen) {         str = str.slice(0, limitLen) + "...";     }     return str; } //获取url中指定key的参数值 export const getQueryParam = (name, url = null) => {     if (!url) url = window.location.search     var q = url.match(new RegExp('[?&]' + name + '=([^&#]*)'))     return (q && q[1]) || '' } //修改url中指定key的参数值 export const setQueryParam = (key, value, uri = null) => {     uri = uri || window.location.href;//window.location.search.href     var re = new RegExp('([?&])' + key + '=.*?(&|$)', 'i')     var separator = uri.indexOf('?') !== -1 ? '&' : '?'     if (uri.match(re)) {         return uri.replace(re, '$1' + key + '=' + value + '$2')     } else {         return uri + separator + key + '=' + value     } }   function pad0(n) {     return n < 10 ? '0' + n : n } //格式化数字,四舍五入(数字/保留小数位/分隔符/前缀) //例: formatNumber(12300094.125,2,',','$') = $12,300,094.13 export const formatNumber = (num, precision = 2, separator = ',', prefix = '') => {     let parts;     // 判断是否为数字     if (!isNaN(parseFloat(num)) && isFinite(num)) {         // 把类似 .5, 5. 之类的数据转化成0.5, 5         num = Number(num)         // 处理小数点位数         num = (typeof precision !== 'undefined'             ? num.toFixed(precision)             : num         ).toString()         // 分离数字的小数部分和整数部分         parts = num.split('.')         // 整数部分加[separator]分隔, 借用一个著名的正则表达式         parts[0] = parts[0]             .toString()             .replace(/(\d)(?=(\d{3})+(?!\d))/g, '$1' + (separator || ','))           return prefix + parts.join('.')     }     return '' } //获取日期 yyyy-MM 是否包含中文 cn:0/1 export const formatMonth = (val, cn) => {     if (!val) return ''     const date = new Date(val)     return (         date.getFullYear() +         (cn ? '年-' : '-') +         pad0(date.getMonth() + 1) +         (cn ? '月' : '')     ) } //获取日期 yyyy-MM-dd 是否包含中文 cn:0/1 export const formatDate = (val, cn) => {     if (!val) return ''     const date = new Date(val)     return (         date.getFullYear() +         (cn ? '年-' : '-') +         pad0(date.getMonth() + 1) +         (cn ? '月-' : '-') +         pad0(date.getDate()) +         (cn ? '日' : '')     ) } //获取日期 yyyy-MM-dd HH:mm 是否包含中文 cn:0/1 export const formatDateTime = (val, cn) => {     if (!val) return ''     const date = new Date(val)     return (         formatDate(val, cn) +         ' ' +         pad0(date.getHours()) +         ':' +         pad0(date.getMinutes())     ) } //添加百分号 export const formatRate = (val) => {     if (!val) return '0%'     return val + '%' } //保留两位小数，无四舍五入，无小数补 .00 export const formatPrice = (val) => {     if (!val) return '0.00'     val = val.toFixed(2) + ''     if (val.indexOf('.') == -1) {         return val + '.00'     } else {         return val     } } //保留N位小数，四舍五入，无小数补 .00 export const formatPriceUp = (val, n) => {     let res = (Math.round(val * 100) / 100).toFixed(n);     return res; }

　　这是用在vue.js中的，所以加了导出 export

--获取后缀名，结果 .jpg

var extName = "/upload/head_img/20150902102539.jpg";
var ta = extName.substring(extName.indexOf("."));

 

--判断是否是焦点

if (document.activeElement.id == "txtAutoC") {
//判断是否是焦点
} 

http://www.cnblogs.com/yejiurui/p/3413796.html
http://blog.csdn.net/xyxjn/article/details/41805365