How to use the jsnes.Controller.BUTTON_B function in jsnes
To help you get started, we’ve selected a few jsnes examples, based on popular ways it is used in public projects.
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bfirsh / jsnes-web / src / KeyboardController.js View on Github 
import { Controller } from "jsnes";
// Mapping keyboard code to [controller, button]
const KEYS = {
88: [1, Controller.BUTTON_A, "X"], // X
89: [1, Controller.BUTTON_B, "Y"], // Y (Central European keyboard)
90: [1, Controller.BUTTON_B, "Z"], // Z
17: [1, Controller.BUTTON_SELECT, "Right Ctrl"], // Right Ctrl
13: [1, Controller.BUTTON_START, "Enter"], // Enter
38: [1, Controller.BUTTON_UP, "Up"], // Up
40: [1, Controller.BUTTON_DOWN, "Down"], // Down
37: [1, Controller.BUTTON_LEFT, "Left"], // Left
39: [1, Controller.BUTTON_RIGHT, "Right"], // Right
103: [2, Controller.BUTTON_A, "Num-7"], // Num-7
105: [2, Controller.BUTTON_B, "Num-9"], // Num-9
99: [2, Controller.BUTTON_SELECT, "Num-3"], // Num-3
97: [2, Controller.BUTTON_START, "Num-1"], // Num-1
104: [2, Controller.BUTTON_UP, "Num-8"], // Num-8
98: [2, Controller.BUTTON_DOWN, "Num-2"], // Num-2
100: [2, Controller.BUTTON_LEFT, "Num-4"], // Num-4
102: [2, Controller.BUTTON_RIGHT, "Num-6"] // Num-6
};handleClick={this.listenForKey}
gamepadConfig={this.state.gamepadConfig}
/>
