本文實例講述了JS根據生日算年齡的方法。分享給大家供大家參考。具體實現方法如下：
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 function parseDate(str){ if(str.match(/^d{4}[-/s+]d{1,2}[-/s+]d{1,2}$/)){ return new Date(str.replace(/[-/s+]/i,'/')); } else if(str.match(/^d{8}$/)){ return new Date(str.substring(0,4)+'/'+str.substring(4,6)+'/'+str.substring(6)); } else{ return ('時間轉換發生錯誤！'); } } function GetAgeByBrithday(birthday){ var age=-1; var today=new Date(); var todayYear=today.getFullYear(); var todayMonth=today.getMonth()+1; var todayDay=today.getDate(); var birthday=parseDate(birthday); if(parseDate(birthday)!='時間轉換發生錯誤！') { birthdayYear=birthday.getFullYear(); birthdayMonth=birthday.getMonth(); birthdayDay=birthday.getDate(); if(todayYear-birthdayYear<0) { alert("出生日期選擇錯誤!"); } else { if(todayMonth*1-birthdayMonth*1<0) { age = (todayYear*1-birthdayYear*1)-1; } else { if(todayDay-birthdayDay>=0) {//alert(thisDay+'-'+brithd+"_ddd"); age = (todayYear*1-birthdayYear*1); } else { age = (todayYear*1-birthdayYear*1)-1; } } } return age*1; } else { return -1; } }希望本文所述對大家的javascript程序設計有所幫助。
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