Float32Array

Float32Array typed array represents an array of 32-bit floating point numbers (corresponding to the C float data type) in the platform byte order. If control over byte order is needed, use DataView instead. The contents are initialized to 0 . 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).

构造函数

Float32Array()
创建新的 Float32Array 对象。

静态特性

Float32Array.BYTES_PER_ELEMENT
Returns a number value of the element size. 4 in the case of an Float32Array .
Float32Array.name
Returns the string value of the constructor name. In the case of the Float32Array type: "Float32Array".

静态方法

Float32Array.from()
创建新的 Float32Array from an array-like or iterable object. See also Array.from() .
Float32Array.of()
创建新的 Float32Array with a variable number of arguments. See also Array.of() .

实例特性

Float32Array.prototype.buffer
返回 ArrayBuffer referenced by the Float32Array Fixed at construction time and thus read only .
Float32Array.prototype.byteLength
Returns the length (in bytes) of the Float32Array from the start of its ArrayBuffer . Fixed at construction time and thus read only.
Float32Array.prototype.byteOffset
Returns the offset (in bytes) of the Float32Array from the start of its ArrayBuffer . Fixed at construction time and thus read only.
Float32Array.prototype.length
Returns the number of elements hold in the Float32Array . Fixed at construction time and thus read only.

实例方法

Float32Array.prototype.copyWithin()
Copies a sequence of array elements within the array. See also Array.prototype.copyWithin() .
Float32Array.prototype.entries()
返回新 Array Iterator object that contains the key/value pairs for each index in the array. See also Array.prototype.entries() .
Float32Array.prototype.every()
Tests whether all elements in the array pass the test provided by a function. See also Array.prototype.every() .
Float32Array.prototype.fill()
Fills all the elements of an array from a start index to an end index with a static value. See also Array.prototype.fill() .
Float32Array.prototype.filter()
Creates a new array with all of the elements of this array for which the provided filtering function returns true. See also Array.prototype.filter() .
Float32Array.prototype.find()
Returns the found value in the array, if an element in the array satisfies the provided testing function or undefined if not found. See also Array.prototype.find() .
Float32Array.prototype.findIndex()
Returns the found index in the array, if an element in the array satisfies the provided testing function or -1 if not found. See also Array.prototype.findIndex() .
Float32Array.prototype.forEach()
Calls a function for each element in the array. See also Array.prototype.forEach() .
Float32Array.prototype.includes()
Determines whether a typed array includes a certain element, returning true or false as appropriate. See also Array.prototype.includes() .
Float32Array.prototype.indexOf()
Returns the first (least) index of an element within the array equal to the specified value, or -1 if none is found. See also Array.prototype.indexOf() .
Float32Array.prototype.join()
Joins all elements of an array into a string. See also Array.prototype.join() .
Float32Array.prototype.keys()
返回新 Array Iterator that contains the keys for each index in the array. See also Array.prototype.keys() .
Float32Array.prototype.lastIndexOf()
Returns the last (greatest) index of an element within the array equal to the specified value, or -1 if none is found. See also Array.prototype.lastIndexOf() .
Float32Array.prototype.map()
Creates a new array with the results of calling a provided function on every element in this array. See also Array.prototype.map() .
Float32Array.prototype.reduce()
Apply a function against an accumulator and each value of the array (from left-to-right) as to reduce it to a single value. See also Array.prototype.reduce() .
Float32Array.prototype.reduceRight()
Apply a function against an accumulator and each value of the array (from right-to-left) as to reduce it to a single value. See also Array.prototype.reduceRight() .
Float32Array.prototype.reverse()
Reverses the order of the elements of an array — the first becomes the last, and the last becomes the first. See also Array.prototype.reverse() .
Float32Array.prototype.set()
Stores multiple values in the typed array, reading input values from a specified array.
Float32Array.prototype.slice()
Extracts a section of an array and returns a new array. See also Array.prototype.slice() .
Float32Array.prototype.some()
Returns true if at least one element in this array satisfies the provided testing function. See also Array.prototype.some() .
Float32Array.prototype.sort()
Sorts the elements of an array in place and returns the array. See also Array.prototype.sort() .
Float32Array.prototype.subarray()
返回新 Float32Array from the given start and end element index.
Float32Array.prototype.values()
返回新 Array Iterator object that contains the values for each index in the array. See also Array.prototype.values() .
Float32Array.prototype.toLocaleString()
Returns a localized string representing the array and its elements. See also Array.prototype.toLocaleString() .
Float32Array.prototype.toString()
Returns a string representing the array and its elements. See also Array.prototype.toString() .
Float32Array.prototype[@@iterator]()
返回新 Array Iterator object that contains the values for each index in the array.

范例

Different ways to create a Float32Array

// From a length
var float32 = new Float32Array(2);
float32[0] = 42;
console.log(float32[0]); // 42
console.log(float32.length); // 2
console.log(float32.BYTES_PER_ELEMENT); // 4
// From an array
var arr = new Float32Array([21,31]);
console.log(arr[1]); // 31
// From another TypedArray
var x = new Float32Array([21, 31]);
var y = new Float32Array(x);
console.log(y[0]); // 21
// From an ArrayBuffer
var buffer = new ArrayBuffer(16);
var z = new Float32Array(buffer, 0, 4);
// From an iterable
var iterable = function*(){ yield* [1,2,3]; }();
var float32 = new Float32Array(iterable);
// Float32Array[1, 2, 3]
					

规范

规范
ECMAScript (ECMA-262)
The definition of 'TypedArray constructors' in that specification.

浏览器兼容性

更新 GitHub 上的兼容性数据
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Float32Array Chrome 7 Edge 12 Firefox 4 IE 10 Opera 11.6 Safari 5.1 WebView Android 4 Chrome Android 18 Firefox Android 4 Opera Android 12 Safari iOS 4.2 Samsung Internet Android 1.0 nodejs 0.10
Float32Array() 构造函数 Chrome 7 Edge 12 Firefox 4 IE 10 Opera 11.6 Safari 5.1 WebView Android 4 Chrome Android 18 Firefox Android 4 Opera Android 12 Safari iOS 4.2 Samsung Internet Android 1.0 nodejs 0.10

图例

完整支持
完整支持

另请参阅

Metadata

  1. 标准内置对象
  2. TypedArray
  3. 特性
    1. TypedArray.BYTES_PER_ELEMENT
    2. TypedArray.name
    3. TypedArray.prototype.buffer
    4. TypedArray.prototype.byteLength
    5. TypedArray.prototype.byteOffset
    6. TypedArray.prototype.length
    7. get TypedArray[@@species]
  4. 方法
    1. TypedArray.from()
    2. TypedArray.of()
    3. TypedArray.prototype.copyWithin()
    4. TypedArray.prototype.entries()
    5. TypedArray.prototype.every()
    6. TypedArray.prototype.fill()
    7. TypedArray.prototype.filter()
    8. TypedArray.prototype.find()
    9. TypedArray.prototype.findIndex()
    10. TypedArray.prototype.forEach()
    11. TypedArray.prototype.includes()
    12. TypedArray.prototype.indexOf()
    13. TypedArray.prototype.join()
    14. TypedArray.prototype.keys()
    15. TypedArray.prototype.lastIndexOf()
    16. TypedArray.prototype.map()
    17. TypedArray.prototype.reduce()
    18. TypedArray.prototype.reduceRight()
    19. TypedArray.prototype.reverse()
    20. TypedArray.prototype.set()
    21. TypedArray.prototype.slice()
    22. TypedArray.prototype.some()
    23. TypedArray.prototype.sort()
    24. TypedArray.prototype.subarray()
    25. TypedArray.prototype.toLocaleString()
    26. TypedArray.prototype.toString()
    27. TypedArray.prototype.values()
    28. TypedArray.prototype[@@iterator]()
  5. Related pages:
  6. Int8Array
  7. Uint8Array
  8. Uint8ClampedArray
  9. Int16Array
  10. Uint16Array
  11. Int32Array
  12. Uint32Array
  13. Float32Array
  14. Float64Array
  15. BigInt64Array
  16. BigUint64Array
  17. 继承:
  18. Function
  19. 特性
    1. Function.arguments
    2. Function.caller
    3. Function.displayName
    4. Function.length
    5. Function.name
  20. 方法
    1. Function.prototype.apply()
    2. Function.prototype.bind()
    3. Function.prototype.call()
    4. Function.prototype.toSource()
    5. Function.prototype.toString()
  21. Object
  22. 特性
    1. Object.prototype.__proto__
    2. Object.prototype.constructor
  23. 方法
    1. Object.prototype.__defineGetter__()
    2. Object.prototype.__defineSetter__()
    3. Object.prototype.__lookupGetter__()
    4. Object.prototype.__lookupSetter__()
    5. Object.prototype.hasOwnProperty()
    6. Object.prototype.isPrototypeOf()
    7. Object.prototype.propertyIsEnumerable()
    8. Object.prototype.toLocaleString()
    9. Object.prototype.toSource()
    10. Object.prototype.toString()
    11. Object.prototype.valueOf()
    12. Object.setPrototypeOf()