javascript实现的Date日期格式化函数

发布时间:2019-07-24编辑:脚本学堂
分享一个javascript实现的Date日期格式化函数,有时需要将日期格式化为友好的显示格式,这个函数就用到了,有需要的朋友参考下。

javascript实现的Date日期格式化函数,实例代码如下:
 

复制代码 代码示例:

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML>
 <HEAD>
  <TITLE>javascript下Date格式化函数---www.jb200.com</TITLE>
  <script>
     Date.prototype.format = function(mask) {
        var d = this;    
     var zeroize = function (value, length) {    
         if (!length) length = 2;    
         value = String(value);    
         for (var i = 0, zeros = ''; i < (length - value.length); i++) { 
                zeros += '0'; 
            } 
  
         return zeros + value;    
     };      
     return mask.replace(/"[^"]*"|'[^']*'|b(?:d{1,4}|m{1,4}|M{1,4}|yy(?:yy)?|([hHMstT])1?|[lLZ])b/g, function($0) {
            switch($0) {  
             case 'd':   return d.getDate();  
             case 'dd':  return zeroize(d.getDate());  
             case 'ddd': return ['Sun','Mon','Tue','Wed','Thr','Fri','Sat'][d.getDay()];  
             case 'dddd':    return ['Sunday','Monday','Tuesday','Wednesday','Thursday','Friday','Saturday'][d.getDay()];  
             case 'M':   return d.getMonth() + 1;  
             case 'MM':  return zeroize(d.getMonth() + 1);  
             case 'MMM': return ['Jan','Feb','Mar','Apr','May','Jun','Jul','Aug','Sep','Oct','Nov','Dec'][d.getMonth()];  
             case 'MMMM':
             return ['January','February','March','April','May','June','July','August','September','October','November','December'][d.getMonth()];  
             case 'yy':  return String(d.getFullYear()).substr(2);  
             case 'yyyy':    return d.getFullYear();  
             case 'h':   return d.getHours() % 12 || 12;  
             case 'hh':  return zeroize(d.getHours() % 12 || 12);  
             case 'H':   return d.getHours();  
             case 'HH':  return zeroize(d.getHours());  
             case 'm':   return d.getMinutes();  
             case 'mm':  return zeroize(d.getMinutes());  
             case 's':   return d.getSeconds();  
             case 'ss':  return zeroize(d.getSeconds());  
             case 'l':   return zeroize(d.getMilliseconds(), 3);  
             case 'L':   var m = d.getMilliseconds();  
                     if (m > 99) m = Math.round(m / 10);
                     return zeroize(m);    
             case 'tt': 
                    return d.getHours() < 12 ? 'am' : 'pm';                 
             case 'TT':  return d.getHours() < 12 ? 'AM' : 'PM'; 
                case 'Z':   return d.toUTCString().match(/[A-Z]+$/); 
                // Return quoted strings with the surrounding quotes removed 
                default:    return $0.substr(1, $0.length - 2); 
            }
     });
 }; 

 function init(){
    var date = new Date();
    alert(date.format("MMMM dd,yyyy"));
 }
  </script>
 </HEAD>
 <BODY onload="init();"> 
 </BODY>
</HTML>