typed-arrays

问题 I have a typed array full of binary data that is being generated from an ArrayBuffer var myArr = new Uint8Array(myBuffer); I am presenting this to the user with var blob = new Blob(myArr, {type: "octet/stream"}; var blobURL = URL.createObjectURL(blob); and inserting a link that is "<a href=" + blobUrl + " download=" + filename "/a>" Later, I am letting the user select the file from disk, and using a file reader to do with var reader = new FileReader(); reader.onload = function () { console

问题 I have a typed array full of binary data that is being generated from an ArrayBuffer var myArr = new Uint8Array(myBuffer); I am presenting this to the user with var blob = new Blob(myArr, {type: "octet/stream"}; var blobURL = URL.createObjectURL(blob); and inserting a link that is "<a href=" + blobUrl + " download=" + filename "/a>" Later, I am letting the user select the file from disk, and using a file reader to do with var reader = new FileReader(); reader.onload = function () { console

问题 I have a nodejs script where I'd like to parse MP3 frames. Those frames are easy to detect since each frame starts with the two bytes 0xff 0xfb . I'm using a Uint8Array to access the bytes of that file. Using [].indexOf.call(data, 0xff) I can easily search for a single byte but not for two bytes. Obviously I could check the second byte manually but I wonder if there's a clean way to get the index of a certain byte sequence. 回答1: Apparently there is no nice way to do this without writing

问题 The only real tutorial I have seen for ArrayBuffer is from HTML5Rocks. But I am wondering specifically how to manipulate the individual bytes. For example, this cartoon on ArrayBuffers from Mozilla shows an image of an ArrayBuffer wrapped in a Uint8Array view: It gives the feeling that you can do this with an ArrayBuffer: var x = new ArrayBuffer(10) x[0] = 1 x[1] = 0 ... x[9] = 1 That is, manually setting the bytes. But I haven't seen any documentation on such a feature. Instead, it seems you

问题 The only real tutorial I have seen for ArrayBuffer is from HTML5Rocks. But I am wondering specifically how to manipulate the individual bytes. For example, this cartoon on ArrayBuffers from Mozilla shows an image of an ArrayBuffer wrapped in a Uint8Array view: It gives the feeling that you can do this with an ArrayBuffer: var x = new ArrayBuffer(10) x[0] = 1 x[1] = 0 ... x[9] = 1 That is, manually setting the bytes. But I haven't seen any documentation on such a feature. Instead, it seems you

问题 The only real tutorial I have seen for ArrayBuffer is from HTML5Rocks. But I am wondering specifically how to manipulate the individual bytes. For example, this cartoon on ArrayBuffers from Mozilla shows an image of an ArrayBuffer wrapped in a Uint8Array view: It gives the feeling that you can do this with an ArrayBuffer: var x = new ArrayBuffer(10) x[0] = 1 x[1] = 0 ... x[9] = 1 That is, manually setting the bytes. But I haven't seen any documentation on such a feature. Instead, it seems you

问题 This question is for a deeper understanding of my previous question about large size Canvas animation. The question is here: Repeat HTML canvas element (box) to fill whole viewport I am trying to understand the logic behind the TypedArray - Uint8ClampedArray. I will first start with my research and get to the question itself later. So, ImageData represents the pixel data of the HTML5 Canvas. It allows for much faster performance and is good for heavy animations. After we have our ImageData

问题 This question is for a deeper understanding of my previous question about large size Canvas animation. The question is here: Repeat HTML canvas element (box) to fill whole viewport I am trying to understand the logic behind the TypedArray - Uint8ClampedArray. I will first start with my research and get to the question itself later. So, ImageData represents the pixel data of the HTML5 Canvas. It allows for much faster performance and is good for heavy animations. After we have our ImageData

问题 This question is for a deeper understanding of my previous question about large size Canvas animation. The question is here: Repeat HTML canvas element (box) to fill whole viewport I am trying to understand the logic behind the TypedArray - Uint8ClampedArray. I will first start with my research and get to the question itself later. So, ImageData represents the pixel data of the HTML5 Canvas. It allows for much faster performance and is good for heavy animations. After we have our ImageData

问题 This question is for a deeper understanding of my previous question about large size Canvas animation. The question is here: Repeat HTML canvas element (box) to fill whole viewport I am trying to understand the logic behind the TypedArray - Uint8ClampedArray. I will first start with my research and get to the question itself later. So, ImageData represents the pixel data of the HTML5 Canvas. It allows for much faster performance and is good for heavy animations. After we have our ImageData