小编Add*_*eah的帖子

// jshint esversion: 6

window.onload = function () {
    var canvas = document.getElementById("canvas");
    /** @type {CanvasRenderingContext2D} */
    var ctx = canvas.getContext("2d");

    // images
    var squirrel_img = document.getElementById("squirrel-img");
    var trees_img = document.getElementById("tree-img");

    var scoreboard_div = document.getElementById("scoreboard"); // scoreboard
    var score = 0; // score

    // styles
    canvas.width = window.innerWidth * 0.75;
    canvas.height = window.innerHeight;
    canvas.style.border = "15px ridge red";
    canvas.style.borderRadius = "5px";

    ctx.drawImage(trees_img, 0, 0, canvas.width, canvas.height); // background image

    function clearCanvas() {
        ctx.clearRect(0, 0, canvas.width, …