function sum(array) { // Compute the sum of the elements of an array let sum = 0; // Start with an initial sum of 0. for(let x of array) { // Loop over array, assigning each element to x. sum += x; // Add the element value to the sum. } // This is the end of the...
let empty = {}; // An object with no properties let point = { x: 0, y: 0 }; // Two numeric properties let p2 = { x: point.x, y: point.y+1 }; // More complex values let book = { "main title": "JavaScript", // These property names include spaces, "sub-title": "The...
classPoint{// By convention, class names are capitalized.constructor(x, y) {// Constructor function to initialize new instances.this.x= x;// This keyword is the new object being initialized.this.y= y;// Store function arguments as object properties.}// No return is necessary in constructor...
Now that we have created our 2D array in JavaScript, let us learn what operations can be performed on this array. We would look at how to access, insert, remove and update elements in our array. So, we create an array and initialize it with values as below: var array2D = new Array(...
alert("Unable to initialize WebGL. Your browser may not support it."); gl = null; } return gl; } // 创建并编译一个着色器 function compileShader(gl, shaderSource, shaderType) { var shader = gl.createShader(shaderType); gl.shaderSource(shader, shaderSource); ...
leta;// Oops, we forgot to initialize this variable!letindex =0;try{ a[index++];// Throws TypeError}catch(e) { index// => 1: increment occurs before TypeError is thrown} a?.[index++]// => undefined: because a is undefinedindex// => 1: not incremented because ?.[] short-circuit...
with this functionlet decoder = new TextDecoder("utf-8"); // For converting bytes to textlet body = ""; // Text read so farwhile(true) { // Loop until we exit belowlet {done, value} = await reader.read(); // Read a chunkif (value) { // If we got a byte array:if (...
Typically this method is implemented to start watching property changes on the layer and to initialize WebGL objects such as shaders. See also detach() Example // Create a shader program and a property watcher attach() { let gl = this.context; this._shaderProgram = gl.createProgram...
CanvasRenderingContext2D 定义了四种绘制矩形的方法。这四种矩形方法都需要两个参数,指定矩形的一个角,然后是矩形的宽度和高度。通常,您指定左上角,然后传递正宽度和正高度,但也可以指定其他角并传递负尺寸。 fillRect() 使用当前的fillStyle填充指定的矩形。strokeRect() 使用当前的strokeStyle和其他线条属性描绘指定矩...
我们将这种类比归功于 Ashi Krishnan 在 JSConf EU 2018 上的名为“JS 中的深度学习”的演讲:mng.bz/VPa0。 与稠密层相比,conv2d 层具有更多的配置参数。kernelSize和filters是 conv2d 层的两个关键参数。为了理解它们的含义,我们需要在概念层面上描述 2D 卷积是如何工作的。