date物件 – 時間
四種初始化日期格式
new date();
new date(value);
new date(datestring);
new date(year, monthindex [, day [, hours [, minutes [, seconds [, milliseconds]]]]]);
var today =
newdate()
var d1 =
newdate
("october 13, 1975 11:13:00"
)var d2 =
newdate(79
,5,24
)var d3 =
newdate(79
,5,24
,11,33
,0) console.
log(today,d1,d2,d3)
console.
log(today.
getdate()
)
console.
log(today.
getday()
)
console.
log(today.
getmonth()
)
console.
log(today.
getfullyear()
)
console.
log(today.
gettime()
)
他屬於乙個工具類不需要建立物件，但是裡面封裝許多運算的屬性和方法
圓周率
console.
log(
"圓周率："
+math.
pi)
var num =-1
;console.
log(
"求絕對值："
+math.
abs(-1
))
var a =
3.1;
console.
log(
"ceil(3.1)向上取整"
+math.
ceil
(a))
//4var a =
-3.1
;console.
log(
"ceil(-3.1)向上取整"
+math.
ceil
(a))
//-3
var a =
3.1;
console.
log(
"floor(3.1)向上取整"
+math.
floor
(a))
//3var a =
-3.1
;console.
log(
"floor(-3.1)向上取整"
+math.
floor
(a))
//-4
var a =
3.1;
console.
log(
"round(3.1)四捨五入"
+math.
round
(a))
//3var a =
3.5;
console.
log(
"round(3.5)四捨五入"
+math.
round
(a))
//4var a =
-3.1
;console.
log(
"round(-3.1)四捨五入"
+math.
round
(a))
//-3
var a =
-3.5
;console.
log(
"round(-3.5)四捨五入"
+math.
round
(a))
//-3
生成0-1之間的隨機數
console.
log(math.
random()
)
console.
log(math.
random()
*10)
console.
log(math.
random()
*5+1
)
console.
log(math.
random()
*(y-x)
+x)
console.
log(math.
max(10,
20,30,
40,50,
60))
console.
log(math.
min(10,
30,502,
134)
)
console.
log(math.
pow(3,
3))
console.
log(math.
sqrt(9
))
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