Float64Array
Baseline Widely available
This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015.
Float64Array 类型数组表示按平台字节顺序排列的 64 位浮点数数组。如果需要控制字节顺序，请使用 DataView。除非明确提供初始化数据，否则内容将初始化为 0。一旦建立，你可以使用对象的方法或使用标准数组索引语法（即使用括号表示法）来引用数组中的元素。
¥The Float64Array typed array represents an array of 64-bit floating point numbers in the platform byte order. If control over byte order is needed, use DataView instead. The contents are initialized to 0 unless initialization data is explicitly provided. Once established, you can reference elements in the array using the object's methods, or using standard array index syntax (that is, using bracket notation).
Float64Array 是隐藏 TypedArray 类的子类。
¥Float64Array is a subclass of the hidden TypedArray class.
构造函数
静态属性
¥Static properties
还从其父级 TypedArray 继承静态属性。
¥Also inherits static properties from its parent TypedArray.
Float64Array.BYTES_PER_ELEMENT-
返回元素大小的数值。
8在Float64Array的情况下。
静态方法
实例属性
¥Instance properties
还从其父级 TypedArray 继承实例属性。
¥Also inherits instance properties from its parent TypedArray.
这些属性在 Float64Array.prototype 上定义并由所有 Float64Array 实例共享。
¥These properties are defined on Float64Array.prototype and shared by all Float64Array instances.
Float64Array.prototype.BYTES_PER_ELEMENT-
返回元素大小的数值。如果是
Float64Array，则为8。 Float64Array.prototype.constructor-
创建实例对象的构造函数。对于
Float64Array实例，初始值为Float64Array构造函数。
实例方法
示例
创建 Float64Array 的不同方法
¥Different ways to create a Float64Array
// From a length
const float64 = new Float64Array(2);
float64[0] = 42;
console.log(float64[0]); // 42
console.log(float64.length); // 2
console.log(float64.BYTES_PER_ELEMENT); // 8
// From an array
const x = new Float64Array([21, 31]);
console.log(x[1]); // 31
// From another TypedArray
const y = new Float64Array(x);
console.log(y[0]); // 21
// From an ArrayBuffer
const buffer = new ArrayBuffer(64);
const z = new Float64Array(buffer, 8, 4);
console.log(z.byteOffset); // 8
// From an iterable
const iterable = (function* () {
yield* [1, 2, 3];
})();
const float64FromIterable = new Float64Array(iterable);
console.log(float64FromIterable);
// Float64Array [1, 2, 3]
规范
| Specification |
|---|
| ECMAScript Language Specification # table-49 |
浏览器兼容性
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