js常用的小工具方法

function formatTime(date){ ???var year = date.getFullYear() ???var month = date.getMonth() + 1 ???var day = date.getDate() ???var hour = date.getHours() ???var minute = date.getMinutes() ???var second = date.getSeconds() ???function formatNumber(n){ ?????????n = n.toString() ?????????return n[1] ?? n : ‘0‘ + n ???} ???return [year, month, day].map(formatNumber).join(‘/‘) +‘ ‘+ ?[hour, minute, second].map(formatNumber).join(‘:‘)} ??

function removeArrElement(arr, value){ ???for (var i=0;i<arr.length;i++){ ???????if(arr[i] ?== value) { ???????????arr.splice(i,1); ???????????break; ???????} ???} ???retrun arr;}　

将a中与b索引相同的项的值都替换为b的值。

function extend(a,b){ ???for (var key in b){ ???????if (b[key]){ ????????????a[key] = b[key] ???????} ???} ???return a}

function getElementByAttr(arr,key,value) { ???for(var i=0;i<arr.length;i++){ ???????if(arr[i][key] == value){ ???????????return arr[i] ???????} ???} ???return null}

function objToParams(obj){ ???var arr = [] ???for(var key in obj){ ???????if(obj[key]){ ???????????arr.push(key + "=" + obj[key]) ???????} ???} ???return arr.join("&")}

　　function copyProp(a,b){
???????????　　　　for(var key in b){
???????????????　　　　　　if(b[key]){
???????????????????　　　　　　　　if(a[key]){
???????????????????????　　　　　　　　　　// 什么都别做
???????????????????　　　　　　　　} else {
???????????????????????　　　　　　　　　　a[key] = b[key]
???????????????????　　　　　　　　}
???????????????　　　　　　}
???????????　　　　}　　
???????????　　　　return a
???????　　}

function isMobile(mobile) { ???var reg = /^[0123456789]{11}$/; ???if (!reg.test(mobile)){ ???????return false ???} else { ???????return true ???}}

function getAgeByBirthday(birthday){ ???var returnAge; ???var strBirthdayArr = birthday.split("-"); ???var birthYear = strBirthdayArr[0]; ???var birthMonth = strBirthdayArr[1]; ???var birthDay = strBirthdayArr[2]; ???var d = new Date(); ???var nowYear = d.getFullYear(); ???var nowMonth = d.getMonth() + 1; ???var nowDay = d.getDate(); ???if(nowYear == birthYear){ ???????returnAge = 0; ?//同年 则为0岁 ???} else { ???????var ageDiff = nowYear - birthYear; ???????if(ageDiff > 0){ ???????????if (nowMonth == birthMonth) { ???????????????var dayDiff = nowDay - birthDay;//日之差 ???????????????if (dayDiff < 0) { ???????????????????returnAge = ageDiff - 1; ???????????????} ???????????????else { ???????????????????returnAge = ageDiff; ???????????????} ???????????} ???????????else { ???????????????var monthDiff = nowMonth - birthMonth;//月之差 ???????????????if (monthDiff < 0) { ???????????????????returnAge = ageDiff - 1; ???????????????} ???????????????else { ???????????????????returnAge = ageDiff; ???????????????} ???????????} ???????} ???????else { ???????????returnAge = -1;//返回-1 表示出生日期输入错误 晚于今天 ???????} ???} ???return returnAge;//返回周岁年龄}