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}
}, m.matcher = m.matches = function(n) {
return n = m.extendOwn({}, n),
function(t) {
return m.isMatch(t, n)
}
}, m.times = function(n, t, r) {
var e = Array(Math.max(0, n));
t = b(t, r, 1);
for(var u = 0; n > u; u++) e[u] = t(u);
return e
}, m.random = function(n, t) {
return null == t && (t = n, n = 0), n + Math.floor(Math.random() * (t - n + 1))
}, m.now = Date.now || function() {
return(new Date).getTime()
};
var B = {
"&": "&",
"<": "<",
">": ">",
'"': """,
"'": "'",
"`": "`"
},
T = m.invert(B),
R = function(n) {
var t = function(t) {
return n[t]
},
r = "(?:" + m.keys(n).join("|") + ")",
e = RegExp(r),
u = RegExp(r, "g");
return function(n) {
return n = null == n ? "" : "" + n, e.test(n) ? n.replace(u, t) : n
}
};
m.escape = R(B), m.unescape = R(T), m.result = function(n, t, r) {
var e = null == n ? void 0 : n[t];
return e === void 0 && (e = r), m.isFunction(e) ? e.call(n) : e
};
var q = 0;
m.uniqueId = function(n) {
var t = ++q + "";
return n ? n + t : t
}, m.templateSettings = {
evaluate: /<%([\s\S]+?)%>/g,
interpolate: /<%=([\s\S]+?)%>/g,
escape: /<%-([\s\S]+?)%>/g
};
var K = /(.)^/,
z = {
"'": "'",
"\\": "\\",
"\r": "r",
"\n": "n",
"\u2028": "u2028",
"\u2029": "u2029"
},
D = /\\|'|\r|\n|\u2028|\u2029/g,
L = function(n) {
return "\\" + z[n]
};
m.template = function(n, t, r) {
!t && r && (t = r), t = m.defaults({}, t, m.templateSettings);
var e = RegExp([(t.escape || K).source, (t.interpolate || K).source, (t.evaluate || K).source].join("|") + "|$", "g"),
u = 0,
i = "__p+='";
n.replace(e, function(t, r, e, o, a) {
return i += n.slice(u, a).replace(D, L), u = a + t.length, r ? i += "'+\n((__t=(" + r + "))==null?'':_.escape(__t))+\n'" : e ? i += "'+\n((__t=(" + e + "))==null?'':__t)+\n'" : o && (i += "';\n" + o + "\n__p+='"), t
}), i += "';\n", t.variable || (i = "with(obj||{}){\n" + i + "}\n"), i = "var __t,__p='',__j=Array.prototype.join," + "print=function(){__p+=__j.call(arguments,'');};\n" + i + "return __p;\n";
try {
var o = new Function(t.variable || "obj", "_", i)
} catch(a) {
throw a.source = i, a
}
var c = function(n) {
return o.call(this, n, m)
},
f = t.variable || "obj";
return c.source = "function(" + f + "){\n" + i + "}", c
}, m.chain = function(n) {
var t = m(n);
return t._chain = !0, t
};
var P = function(n, t) {
return n._chain ? m(t).chain() : t
};
m.mixin = function(n) {
m.each(m.functions(n), function(t) {
var r = m[t] = n[t];
m.prototype[t] = function() {
var n = [this._wrapped];
return f.apply(n, arguments), P(this, r.apply(m, n))
}
})
}, m.mixin(m), m.each(["pop", "push", "reverse", "shift", "sort", "splice", "unshift"], function(n) {
var t = o[n];
m.prototype[n] = function() {
var r = this._wrapped;
return t.apply(r, arguments), "shift" !== n && "splice" !== n || 0 !== r.length || delete r[0], P(this, r)
}
}), m.each(["concat", "join", "slice"], function(n) {
var t = o[n];
m.prototype[n] = function() {
return P(this, t.apply(this._wrapped, arguments))
}
}), m.prototype.value = function() {
return this._wrapped
}, m.prototype.valueOf = m.prototype.toJSON = m.prototype.value, m.prototype.toString = function() {
return "" + this._wrapped
}, "function" == typeof define && define.amd && define("underscore", [], function() {
return m
})
}).call(this);
const canvas = document.getElementById('canvas');
const ctx = canvas.getContext('2d');
canvas.width = 1000;
canvas.height = 600;
canvas.style.background = '#000';
class Ball {
constructor(x, y, color) {
this.x = x;
this.y = y;
this.color = color;
this.r = 40;
}
render() {
ctx.save();
ctx.beginPath();
ctx.arc(this.x, this.y, this.r, 0, Math.PI * 2);
ctx.fillStyle = this.color;
ctx.fill();
ctx.restore();
}
}
class MoveBall extends Ball {
constructor(x, y, color) {
super(x, y, color);
this.dX = _.random( - 5, 5);
this.dY = _.random( - 5, 5);
this.dR = _.random(1, 3)
}
update() {
this.x += this.dX;
this.y += this.dY;
this.r -= this.dR;
if (this.r < 0) {
this.r = 0;
}
}
}
let ballArr = [];
let colorArr = ['red', 'green', 'blue', 'yellow', 'purple', 'pink', 'orange'];
canvas.addEventListener('mousemove', function(e) {
ballArr.push(new MoveBall(e.offsetX, e.offsetY, colorArr[_.random(0, colorArr.length - 1)]));
});
setInterval(function() {
ctx.clearRect(0, 0, canvas.width, canvas.height)
for (let i = 0; i < ballArr.length; i++) {
ballArr[i].render();
ballArr[i].update();
}
},
50)
<canvas id="canvas">
当前浏览器不支持canvas
</canvas>
body {
margin: 150px;
}
#canvas {
box-shadow: 0 0 10px #000;
}