摘要：
python内置函数 isinstance(obj,class) 判断一个对象是否是已知的类型,类似type() isinstance语法:isinstance(object,classinfo) object 是实例/对象 classinfo 可以是直接或间接类名,基本类型或者由他们组成的元组 返
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posted @ 2018-11-28 00:02
FindSoul
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摘要：
python面向对象编程三大特性 小结:前面我们说完了类和对象的关系,相信对类和对象的理解更加透彻..让我们一起去研究面向对象的三大特性吧.... 继承 1.什么继承? 在程序中继承就是事物之间的所属关系. 2.继承的语法: 单继承 和多继承 3.父类和子类的关系 1. 子类可以继承父类的方法和属性
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posted @ 2018-11-21 19:58
FindSoul
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python面向对象编程 首先了解下什么是面向过程?什么面向对象?以及他们之间的区别。 面向过程的核心就是过程, 面向过程就是分析出解决问题所需要的步骤，就像写函数中把这些步骤一步一步实现，使用的时候一个一个依次调用就可以了,考虑的比较周 面向对象是把构成问题事务分解成各个对象，建立对象的目的不是为
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posted @ 2018-11-20 22:29
FindSoul
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posted @ 2018-11-20 08:43
FindSoul
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功能要求： 1.要求用户输入自己拥有的总资产，例如：30000 2.显示商品列表的序号,商品名称,商品价格，让用户根据序号选择商品，然后加入购物车 例如: 1 Macbook 12000 2 Logines 8730 3 Villa 6500003.用户可以多次购买商品4.用户输入q退出|输入n结算
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posted @ 2018-11-09 01:30
FindSoul
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摘要：
bytes和str的区别1.英文 b'alex'的表现形式与str没什么两样 2.中文 b'\xe4\xb8\xad'这是一个汉字在utf-8的bytes表现形式 3.中文 b'\xce\xd2'这是一个汉字在gbk的bytes 的表现形式bytes与字符串的相互转换 s = '我' s1 = s.encode('gbk') #针对中文str '我' 以GBK 进行编码 print(s1) ...
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posted @ 2018-10-30 08:22
FindSoul
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为了让小白和初学者更加快速的记住 str 操作 重要程度自身而下. 希望能够帮助自己和读者更快更明确的记住这些用法.请用心查看,2018-10-2816:07:32 字符串能做什么操作?重点1.切片name = 'liuxiaofei'# print(name[:3]) # 切片格式:[起始位置:终
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posted @ 2018-10-28 16:09
FindSoul
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application 应用程式 应用、应用程序 application framework 应用程式框架、应用框架 应用程序框架 architecture 架构、系统架构 体系结构 argument 引数（传给函式的值）。叁见 parameter 叁数、实质叁数、实叁、自变量 array 阵列 数
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posted @ 2018-10-19 23:27
FindSoul
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var RENDERER = {
POINT_INTERVAL : 5,
FISH_COUNT : 3,
MAX_INTERVAL_COUNT : 50,
INIT_HEIGHT_RATE : 0.5,
THRESHOLD : 50,
init : function(){
this.setParameters();
this.reconstructMethods();
this.setup();
this.bindEvent();
this.render();
},
setParameters : function(){
this.$window = $(window);
this.$container = $('#jsi-flying-fish-container');
this.$canvas = $('');
this.context = this.$canvas.appendTo(this.$container).get(0).getContext('2d');
this.points = [];
this.fishes = [];
this.watchIds = [];
},
createSurfacePoints : function(){
var count = Math.round(this.width / this.POINT_INTERVAL);
this.pointInterval = this.width / (count - 1);
this.points.push(new SURFACE_POINT(this, 0));
for(var i = 1; i < count; i++){
var point = new SURFACE_POINT(this, i * this.pointInterval),
previous = this.points[i - 1];
point.setPreviousPoint(previous);
previous.setNextPoint(point);
this.points.push(point);
}
},
reconstructMethods : function(){
this.watchWindowSize = this.watchWindowSize.bind(this);
this.jdugeToStopResize = this.jdugeToStopResize.bind(this);
this.startEpicenter = this.startEpicenter.bind(this);
this.moveEpicenter = this.moveEpicenter.bind(this);
this.reverseVertical = this.reverseVertical.bind(this);
this.render = this.render.bind(this);
},
setup : function(){
this.points.length = 0;
this.fishes.length = 0;
this.watchIds.length = 0;
this.intervalCount = this.MAX_INTERVAL_COUNT;
this.width = this.$container.width();
this.height = this.$container.height();
this.fishCount = this.FISH_COUNT * this.width / 500 * this.height / 500;
this.$canvas.attr({width : this.width, height : this.height});
this.reverse = false;
this.fishes.push(new FISH(this));
this.createSurfacePoints();
},
watchWindowSize : function(){
this.clearTimer();
this.tmpWidth = this.$window.width();
this.tmpHeight = this.$window.height();
this.watchIds.push(setTimeout(this.jdugeToStopResize, this.WATCH_INTERVAL));
},
clearTimer : function(){
while(this.watchIds.length > 0){
clearTimeout(this.watchIds.pop());
}
},
jdugeToStopResize : function(){
var width = this.$window.width(),
height = this.$window.height(),
stopped = (width == this.tmpWidth && height == this.tmpHeight);
this.tmpWidth = width;
this.tmpHeight = height;
if(stopped){
this.setup();
}
},
bindEvent : function(){
this.$window.on('resize', this.watchWindowSize);
this.$container.on('mouseenter', this.startEpicenter);
this.$container.on('mousemove', this.moveEpicenter);
this.$container.on('click', this.reverseVertical);
},
getAxis : function(event){
var offset = this.$container.offset();
return {
x : event.clientX - offset.left + this.$window.scrollLeft(),
y : event.clientY - offset.top + this.$window.scrollTop()
};
},
startEpicenter : function(event){
this.axis = this.getAxis(event);
},
moveEpicenter : function(event){
var axis = this.getAxis(event);
if(!this.axis){
this.axis = axis;
}
this.generateEpicenter(axis.x, axis.y, axis.y - this.axis.y);
this.axis = axis;
},
generateEpicenter : function(x, y, velocity){
if(y < this.height / 2 - this.THRESHOLD || y > this.height / 2 + this.THRESHOLD){
return;
}
var index = Math.round(x / this.pointInterval);
if(index < 0 || index >= this.points.length){
return;
}
this.points[index].interfere(y, velocity);
},
reverseVertical : function(){
this.reverse = !this.reverse;
for(var i = 0, count = this.fishes.length; i < count; i++){
this.fishes[i].reverseVertical();
}
},
controlStatus : function(){
for(var i = 0, count = this.points.length; i < count; i++){
this.points[i].updateSelf();
}
for(var i = 0, count = this.points.length; i < count; i++){
this.points[i].updateNeighbors();
}
if(this.fishes.length < this.fishCount){
if(--this.intervalCount == 0){
this.intervalCount = this.MAX_INTERVAL_COUNT;
this.fishes.push(new FISH(this));
}
}
},
render : function(){
requestAnimationFrame(this.render);
this.controlStatus();
this.context.clearRect(0, 0, this.width, this.height);
this.context.fillStyle = 'hsl(0, 0%, 95%)';
for(var i = 0, count = this.fishes.length; i < count; i++){
this.fishes[i].render(this.context);
}
this.context.save();
this.context.globalCompositeOperation = 'xor';
this.context.beginPath();
this.context.moveTo(0, this.reverse ? 0 : this.height);
for(var i = 0, count = this.points.length; i < count; i++){
this.points[i].render(this.context);
}
this.context.lineTo(this.width, this.reverse ? 0 : this.height);
this.context.closePath();
this.context.fill();
this.context.restore();
}
};
var SURFACE_POINT = function(renderer, x){
this.renderer = renderer;
this.x = x;
this.init();
};
SURFACE_POINT.prototype = {
SPRING_CONSTANT : 0.03,
SPRING_FRICTION : 0.9,
WAVE_SPREAD : 0.3,
ACCELARATION_RATE : 0.01,
init : function(){
this.initHeight = this.renderer.height * this.renderer.INIT_HEIGHT_RATE;
this.height = this.initHeight;
this.fy = 0;
this.force = {previous : 0, next : 0};
},
setPreviousPoint : function(previous){
this.previous = previous;
},
setNextPoint : function(next){
this.next = next;
},
interfere : function(y, velocity){
this.fy = this.renderer.height * this.ACCELARATION_RATE * ((this.renderer.height - this.height - y) >= 0 ? -1 : 1) * Math.abs(velocity);
},
updateSelf : function(){
this.fy += this.SPRING_CONSTANT * (this.initHeight - this.height);
this.fy *= this.SPRING_FRICTION;
this.height += this.fy;
},
updateNeighbors : function(){
if(this.previous){
this.force.previous = this.WAVE_SPREAD * (this.height - this.previous.height);
}
if(this.next){
this.force.next = this.WAVE_SPREAD * (this.height - this.next.height);
}
},
render : function(context){
if(this.previous){
this.previous.height += this.force.previous;
this.previous.fy += this.force.previous;
}
if(this.next){
this.next.height += this.force.next;
this.next.fy += this.force.next;
}
context.lineTo(this.x, this.renderer.height - this.height);
}
};
var FISH = function(renderer){
this.renderer = renderer;
this.init();
};
FISH.prototype = {
GRAVITY : 0.4,
init : function(){
this.direction = Math.random() < 0.5;
this.x = this.direction ? (this.renderer.width + this.renderer.THRESHOLD) : -this.renderer.THRESHOLD;
this.previousY = this.y;
this.vx = this.getRandomValue(4, 10) * (this.direction ? -1 : 1);
if(this.renderer.reverse){
this.y = this.getRandomValue(this.renderer.height * 1 / 10, this.renderer.height * 4 / 10);
this.vy = this.getRandomValue(2, 5);
this.ay = this.getRandomValue(0.05, 0.2);
}else{
this.y = this.getRandomValue(this.renderer.height * 6 / 10, this.renderer.height * 9 / 10);
this.vy = this.getRandomValue(-5, -2);
this.ay = this.getRandomValue(-0.2, -0.05);
}
this.isOut = false;
this.theta = 0;
this.phi = 0;
},
getRandomValue : function(min, max){
return min + (max - min) * Math.random();
},
reverseVertical : function(){
this.isOut = !this.isOut;
this.ay *= -1;
},
controlStatus : function(context){
this.previousY = this.y;
this.x += this.vx;
this.y += this.vy;
this.vy += this.ay;
if(this.renderer.reverse){
if(this.y > this.renderer.height * this.renderer.INIT_HEIGHT_RATE){
this.vy -= this.GRAVITY;
this.isOut = true;
}else{
if(this.isOut){
this.ay = this.getRandomValue(0.05, 0.2);
}
this.isOut = false;
}
}else{
if(this.y < this.renderer.height * this.renderer.INIT_HEIGHT_RATE){
this.vy += this.GRAVITY;
this.isOut = true;
}else{
if(this.isOut){
this.ay = this.getRandomValue(-0.2, -0.05);
}
this.isOut = false;
}
}
if(!this.isOut){
this.theta += Math.PI / 20;
this.theta %= Math.PI * 2;
this.phi += Math.PI / 30;
this.phi %= Math.PI * 2;
}
this.renderer.generateEpicenter(this.x + (this.direction ? -1 : 1) * this.renderer.THRESHOLD, this.y, this.y - this.previousY);
if(this.vx > 0 && this.x > this.renderer.width + this.renderer.THRESHOLD || this.vx < 0 && this.x < -this.renderer.THRESHOLD){
this.init();
}
},
render : function(context){
context.save();
context.translate(this.x, this.y);
context.rotate(Math.PI + Math.atan2(this.vy, this.vx));
context.scale(1, this.direction ? 1 : -1);
context.beginPath();
context.moveTo(-30, 0);
context.bezierCurveTo(-20, 15, 15, 10, 40, 0);
context.bezierCurveTo(15, -10, -20, -15, -30, 0);
context.fill();
context.save();
context.translate(40, 0);
context.scale(0.9 + 0.2 * Math.sin(this.theta), 1);
context.beginPath();
context.moveTo(0, 0);
context.quadraticCurveTo(5, 10, 20, 8);
context.quadraticCurveTo(12, 5, 10, 0);
context.quadraticCurveTo(12, -5, 20, -8);
context.quadraticCurveTo(5, -10, 0, 0);
context.fill();
context.restore();
context.save();
context.translate(-3, 0);
context.rotate((Math.PI / 3 + Math.PI / 10 * Math.sin(this.phi)) * (this.renderer.reverse ? -1 : 1));
context.beginPath();
if(this.renderer.reverse){
context.moveTo(5, 0);
context.bezierCurveTo(10, 10, 10, 30, 0, 40);
context.bezierCurveTo(-12, 25, -8, 10, 0, 0);
}else{
context.moveTo(-5, 0);
context.bezierCurveTo(-10, -10, -10, -30, 0, -40);
context.bezierCurveTo(12, -25, 8, -10, 0, 0);
}
context.closePath();
context.fill();
context.restore();
context.restore();
this.controlStatus(context);
}
};
$(function(){
RENDERER.init();
});
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