js判断一年中的多少天
字符串判断
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
</head>
<body>
<script>
var year=2016;
var moth=6;
var day=22;
var arr=[31,28,31,30,31,30,31,31,30,31,30,31];
if(year%4===0 && year%100!==0 || year%400===0){
arr[1]=29;
}
while(moth>1){
day=arr[moth-2]+day;
moth--;
}
console.log(day);
</script>
</body>
</html>
switch判断
```<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
</head>
<body>
<script>
var year=2016;
var moth=1;
var day=22;
if(moth>3){
if(year%4===0 && year%100!==0 || year%400===0){
day+=1;
}
}
while(moth>1){
switch(moth-1){
case 1:
case 3:
case 5:
case 7:
case 8:
case 10:
case 12:
day=day+31;
break;
case 2:
day=day+28;
break;
case 4:
case 6:
case 9:
case 10:
day=day+30;
break;
}
moth--;
}
console.log(day);
</script>
</body>
</html>
