javascript實現日期格式轉換

2019-11-20 13:42:16

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供稿：網友

<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>日期輸入</title>
<script>
window.onload = function(){
    var aLaydate = document.getElementsByClassName("date");
    for(var i = 0;i < aLaydate.length;i ++)
    {
        aLaydate[i].onchange = function(){
            var dateValue = this.value;
            dateValue = dateValue.replace(//。/g,"-");
            dateValue = dateValue.replace(//./g,"-");
            if(dateValue.length == 8){
                var temp = dateValue.substring(0,4) + "-" + dateValue.substring(4,6) + "-" + dateValue.substring(6,8);
                dateValue = temp;
                console.log(dateValue);
            }
            if(CheckDT(dateValue)){
                this.value = dateValue;
            }
            else
            {
                alert("日期輸入錯誤");
            }
        }
    }
}
 
function CheckDT(str)    
{    
    var r = str.match(/^(/d{1,4})(-|//)(/d{1,2})/2(/d{1,2})$/);    
    if(r==null)
    {
        return false;    
    }
    else
    {
        var d= new Date(r[1], r[3]-1, r[4]);    
        return (d.getFullYear()==r[1]&&(d.getMonth()+1)==r[3]&&d.getDate()==r[4]);
    }   
}
</script>
</head>
<body>
<input placeholder="請輸入日期" class="date">
</body>
</html>