Question

JavaScript中怎么将24小时制转换为12小时制？

有没有一个函数什么的将其转换？

Answer 1

<script>
  var fillZero = function(v){ 
         if(v-10<0){v='0'+v;} 
         return v; 
     } 
   var formatHourT012 = function(){
        var d = new Date(); 
        var H = fillZero(d.getHours()); 
        if(H -12 <=0){ 
              H = 'AM' + H; 
          }else if(H-12>0 && H-24<0){ 
              H = H - 12; 
              H = 'PM' + fillZero(H); 
          }else if(H-24 ==0){ 
              H ='PM'+ 00; 
          } 
          return H;
    }
</script>

希望对你有帮助。

Answer 2

代码如下：
window.onload = showTheTime;
function showTheTime() {
var now = new Date(); document.getElementById("showTime").innerHTML =
showTheHours(now.getHours()) +
→showZeroFilled(now.getMinutes()) + showZeroFilled
(now.getSeconds()) + showAmPm();
setTimeout(showTheTime,1000);

function showTheHours(theHour) {
if (show24Hour() || (theHour > 0 && theHour < 13)) {
return theHour;
}
if (theHour = = 0) {
return 12;
}
return theHour-12;
}

function showZeroFilled(inValue) {
if (inValue > 9) {
return ":" + inValue;
}
return ":0" + inValue;
} function show24Hour() {
return (document.getElementById ("show24").checked);
}

function showAmPm() {
if (show24Hour()) {
return "";
}
if ((now.getHours() < 12)) {
return " AM";
}
return " PM";
}
}

Answer 3

(new Date).getHours()%12

如果不希望12:00变成00:00就再加一个等于0的时候+12

Answer 4

大于12减去12不就是了

Answer 5

时间字母大写改成小写试试