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# Math
Math 是一个内置对象，它拥有一些数学常数属性和数学函数方法。
# 静态属性
# E
Math.E 属性表示自然对数的底数（或称为基数），e，约等于 2.718。
function getNapier():number {
return Math.E;
}
console.log(getNapier());
// expected output: 2.718281828459045
Compatibility
| Android version | Android uni-app | Android uni-app-x | iOS version | iOS uni-app | iOS uni-app-x |
|---|---|---|---|---|---|
| 4.4 | √ | 3.9.0 | 9.0 | √ | x |
# LN10
Math.LN10 属性表示 10 的自然对数，约为 2.302
function getNatLog10():number {
return Math.LN10;
}
console.log(getNatLog10());
// expected output: 2.302585092994046
Compatibility
| Android version | Android uni-app | Android uni-app-x | iOS version | iOS uni-app | iOS uni-app-x |
|---|---|---|---|---|---|
| 4.4 | √ | 3.9.0 | 9.0 | √ | x |
# LN2
Math.LN2 属性表示 2 的自然对数，约为 0.693
function getNatLog2():number {
return Math.LN2;
}
console.log(getNatLog2());
// expected output: 0.6931471805599453
Compatibility
| Android version | Android uni-app | Android uni-app-x | iOS version | iOS uni-app | iOS uni-app-x |
|---|---|---|---|---|---|
| 4.4 | √ | 3.9.0 | 9.0 | √ | x |
# LOG2E
Math.LOG2E 属性表示以 2 为底数，e 的对数，约为 1.442
function getLog2e():number {
return Math.LOG2E;
}
console.log(getLog2e());
// expected output: 1.4426950408889634
Compatibility
| Android version | Android uni-app | Android uni-app-x | iOS version | iOS uni-app | iOS uni-app-x |
|---|---|---|---|---|---|
| 4.4 | √ | 3.9.0 | 9.0 | √ | x |
# LOG10E
Math.LOG10E 属性表示以 10 为底数，e 的对数，约为 0.434
function getLog10e():number {
return Math.LOG10E;
}
console.log(getLog10e());
// expected output: 0.4342944819032518
Compatibility
| Android version | Android uni-app | Android uni-app-x | iOS version | iOS uni-app | iOS uni-app-x |
|---|---|---|---|---|---|
| 4.4 | √ | 3.9.0 | 9.0 | √ | x |
# PI
Math.PI 表示一个圆的周长与直径的比例，约为 3.14159
function calculateCircumference (radius:number):number {
return 2 * Math.PI * radius;
}
console.log(calculateCircumference(1));
// expected output: 6.283185307179586
Compatibility
| Android version | Android uni-app | Android uni-app-x | iOS version | iOS uni-app | iOS uni-app-x |
|---|---|---|---|---|---|
| 4.4 | √ | 3.9.0 | 9.0 | √ | x |
# SQRT1_2
Math.SQRT1_2 属性表示 1/2 的平方根，约为 0.707
function getRoot1_2():number {
return Math.SQRT1_2;
}
console.log(getRoot1_2());
// expected output: 0.7071067811865476
Compatibility
| Android version | Android uni-app | Android uni-app-x | iOS version | iOS uni-app | iOS uni-app-x |
|---|---|---|---|---|---|
| 4.4 | √ | 3.9.0 | 9.0 | √ | x |
# SQRT2
Math.SQRT2 属性表示 2 的平方根，约为 1.414
function getRoot2():number {
return Math.SQRT2;
}
console.log(getRoot2());
// expected output: 1.4142135623730951
Compatibility
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|---|---|---|---|---|---|
| 4.4 | √ | 3.9.0 | 9.0 | √ | x |
# 静态方法
# clz32(x)
Returns the number of leading zero bits in the 32-bit binary representation of a number.
Parameters
| name | type | required | description |
|---|---|---|---|
| x | number | YES | A numeric expression. |
Return value
| Type |
|---|
| number |
console.log(Math.clz32(1));
// expected output: 31
console.log(Math.clz32(1000));
// expected output: 22
console.log(Math.clz32());
// expected output: 32
console.log(Math.clz32(3.5));
// expected output: 30
Compatibility
| Android version | Android uni-app | Android uni-app-x | iOS version | iOS uni-app | iOS uni-app-x |
|---|---|---|---|---|---|
| 4.4 | √ | 3.9.0 | 9.0 | √ | x |
# sign(x)
Returns the sign of the x, indicating whether x is positive, negative or zero.
Parameters
| name | type | required | description |
|---|---|---|---|
| x | number | YES | The numeric expression to test |
Return value
| Type |
|---|
| number |
console.log(Math.sign(3));
// expected output: 1
console.log(Math.sign(-3));
// expected output: -1
console.log(Math.sign(0));
// expected output: 0
Compatibility
| Android version | Android uni-app | Android uni-app-x | iOS version | iOS uni-app | iOS uni-app-x |
|---|---|---|---|---|---|
| 4.4 | √ | 3.9.0 | 9.0 | √ | x |
# log10(x)
Returns the base 10 logarithm of a number.
Parameters
| name | type | required | description |
|---|---|---|---|
| x | number | YES | A numeric expression. |
Return value
| Type |
|---|
| number |
console.log(Math.log10(10));
// expected output: 1
console.log(Math.log10(100));
// expected output: 2
console.log(Math.log10(1));
// expected output: 0
Compatibility
| Android version | Android uni-app | Android uni-app-x | iOS version | iOS uni-app | iOS uni-app-x |
|---|---|---|---|---|---|
| 4.4 | √ | 3.9.0 | 9.0 | √ | x |
# log2(x)
Returns the base 2 logarithm of a number.
Parameters
| name | type | required | description |
|---|---|---|---|
| x | number | YES | A numeric expression. |
Return value
| Type |
|---|
| number |
console.log(Math.log2(2));
// expected output: 1
console.log(Math.log2(1024));
// expected output: 10
console.log(Math.log2(1));
// expected output: 0
Compatibility
| Android version | Android uni-app | Android uni-app-x | iOS version | iOS uni-app | iOS uni-app-x |
|---|---|---|---|---|---|
| 4.4 | √ | 3.9.0 | 9.0 | √ | x |
# log1p(x)
Returns the natural logarithm of 1 + x.
Parameters
| name | type | required | description |
|---|---|---|---|
| x | number | YES | A numeric expression. |
Return value
| Type |
|---|
| number |
console.log(Math.log1p(Math.E-1));
// expected output: 1
console.log(Math.log1p(0));
// expected output: 0
Compatibility
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|---|---|---|---|---|---|
| 4.4 | √ | 3.9.0 | 9.0 | √ | x |
# expm1(x)
Returns the result of (e^x - 1), which is an implementation-dependent approximation to subtracting 1 from the exponential function of x (e raised to the power of x, where e is the base of the natural logarithms).
Parameters
| name | type | required | description |
|---|---|---|---|
| x | number | YES | A numeric expression. |
Return value
| Type |
|---|
| number |
console.log(Math.expm1(1));
// expected output: 1.718281828459045
console.log(Math.expm1(-38));
// expected output: -1
Compatibility
| Android version | Android uni-app | Android uni-app-x | iOS version | iOS uni-app | iOS uni-app-x |
|---|---|---|---|---|---|
| 4.4 | √ | 3.9.0 | 9.0 | √ | x |
# cosh(x)
Returns the hyperbolic cosine of a number.
Parameters
| name | type | required | description |
|---|---|---|---|
| x | number | YES | A numeric expression that contains an angle measured in radians. |
Return value
| Type |
|---|
| number |
console.log(Math.cosh(0));
// expected output: 1
console.log(Math.cosh(1));
// expected output: 1.5430806348152437
console.log(Math.cosh(-1));
// expected output: 1.5430806348152437
Compatibility
| Android version | Android uni-app | Android uni-app-x | iOS version | iOS uni-app | iOS uni-app-x |
|---|---|---|---|---|---|
| 4.4 | √ | 3.9.0 | 9.0 | √ | x |
# sinh(x)
Returns the hyperbolic sine of a number.
Parameters
| name | type | required | description |
|---|---|---|---|
| x | number | YES | A numeric expression that contains an angle measured in radians. |
Return value
| Type |
|---|
| number |
console.log(Math.sinh(0));
// expected output: 0
console.log(Math.sinh(1));
// expected output: 1.1752011936438014
Compatibility
| Android version | Android uni-app | Android uni-app-x | iOS version | iOS uni-app | iOS uni-app-x |
|---|---|---|---|---|---|
| 4.4 | √ | 3.9.0 | 9.0 | √ | x |
# tanh(x)
Returns the hyperbolic tangent of a number.
Parameters
| name | type | required | description |
|---|---|---|---|
| x | number | YES | A numeric expression that contains an angle measured in radians. |
Return value
| Type |
|---|
| number |
console.log(Math.tanh(-1));
// Expected output: -0.7615941559557649
console.log(Math.tanh(0));
// Expected output: 0
console.log(Math.tanh(1));
// Expected output: 0.7615941559557649
Compatibility
| Android version | Android uni-app | Android uni-app-x | iOS version | iOS uni-app | iOS uni-app-x |
|---|---|---|---|---|---|
| 4.4 | √ | 3.9.0 | 9.0 | √ | x |
# acosh(x)
Returns the inverse hyperbolic cosine of a number.
Parameters
| name | type | required | description |
|---|---|---|---|
| x | number | YES | A numeric expression that contains an angle measured in radians. |
Return value
| Type |
|---|
| number |
console.log(Math.acosh(1));
// expected output: 0
console.log(Math.acosh(2));
// expected output: 1.3169578969248166
console.log(Math.acosh(2.5));
// expected output: 1.566799236972411
Compatibility
| Android version | Android uni-app | Android uni-app-x | iOS version | iOS uni-app | iOS uni-app-x |
|---|---|---|---|---|---|
| 4.4 | √ | 3.9.0 | 9.0 | √ | x |
# asinh(x)
Returns the inverse hyperbolic sine of a number.
Parameters
| name | type | required | description |
|---|---|---|---|
| x | number | YES | A numeric expression that contains an angle measured in radians. |
Return value
| Type |
|---|
| number |
console.log(Math.asinh(1));
// expected output: 0.881373587019543
console.log(Math.asinh(0));
// expected output: 0
console.log(Math.asinh(-1));
// expected output: -0.881373587019543
console.log(Math.asinh(2));
// expected output: 1.4436354751788103
Compatibility
| Android version | Android uni-app | Android uni-app-x | iOS version | iOS uni-app | iOS uni-app-x |
|---|---|---|---|---|---|
| 4.4 | √ | 3.9.0 | 9.0 | √ | x |
# atanh(x)
Returns the inverse hyperbolic tangent of a number.
Parameters
| name | type | required | description |
|---|---|---|---|
| x | number | YES | A numeric expression that contains an angle measured in radians. |
Return value
| Type |
|---|
| number |
console.log(Math.atanh(0));
// expected output: 0
console.log(Math.atanh(0.5));
// expected output: 0.5493061443340548
Compatibility
| Android version | Android uni-app | Android uni-app-x | iOS version | iOS uni-app | iOS uni-app-x |
|---|---|---|---|---|---|
| 4.4 | √ | 3.9.0 | 9.0 | √ | x |
# trunc(x)
Returns the integral part of the a numeric expression, x, removing any fractional digits. If x is already an integer, the result is x.
Parameters
| name | type | required | description |
|---|---|---|---|
| x | number | YES | A numeric expression. |
Return value
| Type |
|---|
| number |
console.log(Math.trunc(13.37));
// Expected output: 13
console.log(Math.trunc(42.84));
// Expected output: 42
console.log(Math.trunc(0.123));
// Expected output: 0
Compatibility
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|---|---|---|---|---|---|
| 4.4 | √ | 3.9.0 | 9.0 | √ | x |
# fround(x)
Returns the nearest single precision float representation of a number.
Parameters
| name | type | required | description |
|---|---|---|---|
| x | number | YES | A numeric expression. |
Return value
| Type |
|---|
| number |
console.log(Math.fround(1.5));
// expected output: 1.5
console.log(Math.fround(1.337));
// expected output: 1.3370000123977661
Compatibility
| Android version | Android uni-app | Android uni-app-x | iOS version | iOS uni-app | iOS uni-app-x |
|---|---|---|---|---|---|
| 4.4 | √ | 3.9.0 | 9.0 | 3.9.0 | x |
# abs(x)
RMath.abs(x) 函数返回一个数字的绝对值。
Parameters
| name | type | required | description |
|---|---|---|---|
| x | number | YES | 一个数字 |
Return value
| Type | description |
|---|---|
| number | x 的绝对值。如果 x 是负数（包括 -0），则返回 -x。否则，返回 x |
function difference(a:number, b:number):number {
return Math.abs(a - b);
}
console.log(difference(3, 5));
// expected output: 2
console.log(difference(5, 3));
// expected output: 2
console.log(difference(1.23456, 7.89012));
// expected output: 6.6555599999999995
Compatibility
| Android version | Android uni-app | Android uni-app-x | iOS version | iOS uni-app | iOS uni-app-x |
|---|---|---|---|---|---|
| 4.4 | √ | 3.9.0 | 9.0 | √ | x |
# acos(x)
Math.acos() 返回一个数的反余弦值（单位为弧度）
Parameters
| name | type | required | description |
|---|---|---|---|
| x | number | YES | 一个数值. |
Return value
| Type |
|---|
| number |
console.log(Math.acos(-1));
// expected output: 3.141592653589793
console.log(Math.acos(0));
// expected output: 1.5707963267948966
console.log(Math.acos(1));
// expected output: 0
Compatibility
| Android version | Android uni-app | Android uni-app-x | iOS version | iOS uni-app | iOS uni-app-x |
|---|---|---|---|---|---|
| 4.4 | √ | 3.9.0 | 9.0 | √ | x |
# asin(x)
Math.asin() 方法返回一个数值的反正弦（单位为弧度）
Parameters
| name | type | required | description |
|---|---|---|---|
| x | number | YES | 一个数值 |
Return value
| Type |
|---|
| number |
console.log(Math.asin(-1));
// expected output: -1.5707963267948966 (-pi/2)
console.log(Math.asin(0));
// expected output: 0
console.log(Math.asin(0.5));
// expected output: 0.5235987755982989
console.log(Math.asin(1));
// expected output: 1.5707963267948966
Compatibility
| Android version | Android uni-app | Android uni-app-x | iOS version | iOS uni-app | iOS uni-app-x |
|---|---|---|---|---|---|
| 4.4 | √ | 3.9.0 | 9.0 | √ | x |
# atan(x)
Math.atan() 函数返回一个数值的反正切（以弧度为单位）
Parameters
| name | type | required | description |
|---|---|---|---|
| x | number | YES | 一个数值 |
Return value
| Type |
|---|
| number |
console.log(Math.atan(1));
// expected output: 0.7853981633974483
console.log(Math.atan(0));
// expected output: 0
Compatibility
| Android version | Android uni-app | Android uni-app-x | iOS version | iOS uni-app | iOS uni-app-x |
|---|---|---|---|---|---|
| 4.4 | √ | 3.9.0 | 9.0 | √ | x |
# atan2(y, x)
Math.atan2() 返回从原点 (0,0) 到 (x,y) 点的线段与 x 轴正方向之间的平面角度 (弧度值)，也就是 Math.atan2(y,x)
Parameters
| name | type | required | description |
|---|---|---|---|
| y | number | YES | 数值 |
| x | number | YES | 数值 |
Return value
| Type |
|---|
| number |
console.log(Math.atan2(90, 15));
// expected output: 1.4056476493802699
console.log(Math.atan2(15, 90));
// expected output: 0.16514867741462683
Compatibility
| Android version | Android uni-app | Android uni-app-x | iOS version | iOS uni-app | iOS uni-app-x |
|---|---|---|---|---|---|
| 4.4 | √ | 3.9.0 | 9.0 | √ | x |
# ceil(x)
Math.ceil() 函数总是四舍五入并返回大于等于给定数字的最小整数。
Parameters
| name | type | required | description |
|---|---|---|---|
| x | number | YES | 一个数值 |
Return value
| Type |
|---|
| number |
console.log(Math.ceil(0.95));
// expected output: 1
console.log(Math.ceil(4));
// expected output: 4
console.log(Math.ceil(7.004));
// expected output: 8
console.log(Math.ceil(-7.004));
// expected output: -7
Compatibility
| Android version | Android uni-app | Android uni-app-x | iOS version | iOS uni-app | iOS uni-app-x |
|---|---|---|---|---|---|
| 4.4 | √ | 3.9.0 | 9.0 | √ | x |
# cos(x)
Math.cos() 函数返回一个数值的余弦值。
Parameters
| name | type | required | description |
|---|---|---|---|
| x | number | YES | 一个以弧度为单位的数值。 |
Return value
| Type |
|---|
| number |
console.log(Math.cos(0));
// expected output: 1
console.log(Math.cos(1));
// expected output: 0.5403023058681398
Compatibility
| Android version | Android uni-app | Android uni-app-x | iOS version | iOS uni-app | iOS uni-app-x |
|---|---|---|---|---|---|
| 4.4 | √ | 3.9.0 | 9.0 | √ | x |
# exp(x)
Math.exp() 函数返回 e^x，x 表示参数，e 是欧拉常数（Euler's constant），自然对数的底数。
Parameters
| name | type | required | description |
|---|---|---|---|
| x | number | YES | 一个数值 |
Return value
| Type |
|---|
| number |
console.log(Math.exp(-1));
// expected output: 0.36787944117144233
console.log(Math.exp(0));
// expected output: 1
console.log(Math.exp(1));
// expected output: 2.718281828459045
Compatibility
| Android version | Android uni-app | Android uni-app-x | iOS version | iOS uni-app | iOS uni-app-x |
|---|---|---|---|---|---|
| 4.4 | √ | 3.9.0 | 9.0 | √ | x |
# floor(x)
Math.floor() 函数总是返回小于等于一个给定数字的最大整数。
Parameters
| name | type | required | description |
|---|---|---|---|
| x | number | YES | 一个数字。 |
Return value
| Type |
|---|
| number |
console.log(Math.floor(5.95));
// expected output: 5
console.log(Math.floor(5.05));
// expected output: 5
console.log(Math.floor(5));
// expected output: 5
console.log(Math.floor(-5.05));
// expected output: -6
Compatibility
| Android version | Android uni-app | Android uni-app-x | iOS version | iOS uni-app | iOS uni-app-x |
|---|---|---|---|---|---|
| 4.4 | √ | 3.9.0 | 9.0 | √ | x |
# log(x)
Math.log() 函数返回一个数的自然对数
Parameters
| name | type | required | description |
|---|---|---|---|
| x | number | YES | 一个数字。 |
Return value
| Type |
|---|
| number |
console.log(Math.log(1));
// expected output: 0
console.log(Math.log(10));
// expected output: 2.302585092994046
Compatibility
| Android version | Android uni-app | Android uni-app-x | iOS version | iOS uni-app | iOS uni-app-x |
|---|---|---|---|---|---|
| 4.4 | √ | 3.9.0 | 9.0 | √ | x |
# max(values)
Math.max() 函数返回作为输入参数的最大数字，如果没有参数，则返回 -Infinity
Parameters
| name | type | required | description |
|---|---|---|---|
| values | number[] | YES | 0 个或多个数字，将在其中选择，并返回最大的值。 |
Return value
| Type | description |
|---|---|
| number | 给定数值中最大的数。如果任一参数不能转换为数值，则返回 NaN。如果没有提供参数，返回 -Infinity。 |
console.log(Math.max(1, 3, 2));
// expected output: 3
console.log(Math.max(-1, -3, -2));
// expected output: -1
Compatibility
| Android version | Android uni-app | Android uni-app-x | iOS version | iOS uni-app | iOS uni-app-x |
|---|---|---|---|---|---|
| 4.4 | √ | 3.9.0 | 9.0 | √ | x |
# min(values)
Math.min() 函数返回作为输入参数的数字中最小的一个，如果没有参数，则返回 Infinity。
Parameters
| name | type | required | description |
|---|---|---|---|
| values | number[] | YES | 0 个或多个数字，将在其中选择，并返回最小值。 |
Return value
| Type | description |
|---|---|
| number | 给定数值中最小的数。如果任一参数不能转换为数值，则返回 NaN。如果没有提供参数，返回 Infinity。 |
console.log(Math.min(2, 3, 1));
// expected output: 1
console.log(Math.min(-2, -3, -1));
// expected output: -3
Compatibility
| Android version | Android uni-app | Android uni-app-x | iOS version | iOS uni-app | iOS uni-app-x |
|---|---|---|---|---|---|
| 4.4 | √ | 3.9.0 | 9.0 | √ | x |
# pow(x, y)
Math.pow() 函数返回基数（base）的指数（exponent）次幂，即 base^exponent。
Parameters
| name | type | required | description |
|---|---|---|---|
| x | number | YES | 基数 |
| y | number | YES | 指数 |
Return value
| Type |
|---|
| number |
console.log(Math.pow(7, 3));
// expected output: 343
console.log(Math.pow(4, 0.5));
// expected output: 2
Compatibility
| Android version | Android uni-app | Android uni-app-x | iOS version | iOS uni-app | iOS uni-app-x |
|---|---|---|---|---|---|
| 4.4 | √ | 3.9.0 | 9.0 | √ | x |
# random()
Math.random() 函数返回一个浮点数，伪随机数在范围从0 到小于1，也就是说，从 0（包括 0）往上，但是不包括 1（排除 1），然后您可以缩放到所需的范围。实现将初始种子选择到随机数生成算法;它不能被用户选择或重置。
Return value
| Type | description |
|---|---|
| number | 一个浮点型伪随机数字，在0（包括 0）和1（不包括）之间。 |
function getRandomInt(max:number):number {
return Math.floor(Math.random() * max);
}
console.log(getRandomInt(3));
// expected output: 0, 1 or 2
console.log(getRandomInt(1));
// expected output: 0
console.log(Math.random());
// expected output: a number from 0 to <1
Compatibility
| Android version | Android uni-app | Android uni-app-x | iOS version | iOS uni-app | iOS uni-app-x |
|---|---|---|---|---|---|
| 4.4 | √ | 3.9.0 | 9.0 | √ | x |
# round(x)
Math.round() 函数返回一个数字四舍五入后最接近的整数。
Parameters
| name | type | required | description |
|---|---|---|---|
| x | number | YES | 一个数值。 |
Return value
| Type | description |
|---|---|
| number | 给定数字的值四舍五入到最接近的整数。 |
console.log(Math.round(20.49));
// expected output: 20
console.log(Math.round(20.5));
// expected output: 21
console.log(Math.round(-20.5));
// expected output: -20
console.log(Math.round(-20.51));
// expected output: -21
Compatibility
| Android version | Android uni-app | Android uni-app-x | iOS version | iOS uni-app | iOS uni-app-x |
|---|---|---|---|---|---|
| 4.4 | √ | 3.9.0 | 9.0 | √ | x |
# sin(x)
Math.sin() 函数返回一个数值的正弦值。
Parameters
| name | type | required | description |
|---|---|---|---|
| x | number | YES | 一个数值（以弧度为单位）。 |
Return value
| Type |
|---|
| number |
console.log(Math.sin(0));
// expected output: 0
console.log(Math.sin(1));
// expected output: 0.8414709848078965
Compatibility
| Android version | Android uni-app | Android uni-app-x | iOS version | iOS uni-app | iOS uni-app-x |
|---|---|---|---|---|---|
| 4.4 | √ | 3.9.0 | 9.0 | √ | x |
# sqrt(x)
Math.sqrt() 函数返回一个数的平方根
Parameters
| name | type | required | description |
|---|---|---|---|
| x | number | YES | 一个数值 |
Return value
| Type |
|---|
| number |
function calcHypotenuse(a:number, b:number):number {
return (Math.sqrt((a * a) + (b * b)));
}
console.log(calcHypotenuse(3, 4));
// expected output: 5
console.log(calcHypotenuse(5, 12));
// expected output: 13
console.log(calcHypotenuse(0, 0));
// expected output: 0
Compatibility
| Android version | Android uni-app | Android uni-app-x | iOS version | iOS uni-app | iOS uni-app-x |
|---|---|---|---|---|---|
| 4.4 | √ | 3.9.0 | 9.0 | √ | x |
# tan(x)
Math.tan() 方法返回一个数值的正切值。
Parameters
| name | type | required | description |
|---|---|---|---|
| x | number | YES | 一个数值，表示一个角（单位：弧度）。 |
Return value
| Type |
|---|
| number |
console.log(Math.tan(0));
// expected output: 0
console.log(Math.tan(1));
// expected output: 1.5574077246549023
Compatibility
| Android version | Android uni-app | Android uni-app-x | iOS version | iOS uni-app | iOS uni-app-x |
|---|---|---|---|---|---|
| 4.4 | √ | 3.9.0 | 9.0 | √ | x |