JS中工厂模式的示例分析
这篇文章主要介绍了JS中工厂模式的示例分析，具有一定借鉴价值，感兴趣的朋友可以参考下，希望大家阅读完这篇文章之后大有收获，下面让小编带着大家一起了解一下。
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基于JS工厂模式的H5应用，实现了轮播图功能与滑屏功能，并且实现了文字大小的自适应功能，基于SASS样式开发。
核心的JS代码如下：
index.js
define(function(){
var self = null,
start = null,
move = null,
end = null,
handle = null,
timer = null,
left = 0,
x = 0,
startX = 0,
baseWidth = window.screen.width, // 移动设备屏幕的宽度
baseSize = baseWidth * 0.2, // 滑动切换阈值
banner = document.getElementById("banner"), // 获取Banner
center = document.getElementById("center"), // 获取center
ulList = document.getElementsByTagName("ul"),
incBanner = document.getElementById('incBanner'),
incCenter = document.getElementById('incCenter');
var app = {
init : function(){
self = this;
start = self.touchStart;
move = self.touchMove;
end = self.touchEnd;
handle = self.addHandler;
self.pageInit();
self.bindTouch(banner, start, move, end);
self.bindTouch(center, start, move, end);
self.shiftBanner(banner);
},
pageInit : function(){
for (var i=0; i < ulList.length; i++) {
ulList[i].style.left = 0 + 'px';
ulList[i].style.width = 3 * baseWidth + 'px';
}
},
bindTouch : function(elem, handler1, handler2, handler3){
handle(elem, "touchstart", handler1);
handle(elem, "touchmove", handler2);
handle(elem, "touchend", handler3);
},
touchStart : function(event){
var touch = event.touches[0];
left = parseInt(this.style.left);
x = 0;
startX = 0;
startX = touch.pageX; //刚触摸时的坐标
if(this == banner){
timer = clearInterval(timer);
}
},
touchMove : function(event){ //滑动过程
var touch = event.touches[0];
x = startX - touch.pageX; //滑动的距离
this.style.left = left - x + 'px';
},
touchEnd : function(event){ //手指离开屏幕
self.move(this);
self.moveAdjust(this);
self.indicate(this);
if(this == banner){
self.shiftBanner(banner);
}
},
move : function(elem){
var leftTmp = left; //缓存touchMove结束时的滑动位置
elem.style.left = left;
if (x > baseSize) {
elem.style.left = left - baseWidth + 'px';
} else if (x < -baseSize) {
elem.style.left = left + baseWidth + 'px';
} else {
elem.style.left = leftTmp + 'px';
}
},
moveAdjust : function(elem){
left = parseInt(elem.style.left)
if (left < -baseWidth * 2) {
left = -baseWidth * 2;
elem.style.left = left + 'px';
}
if (left > 0) {
left = 0;
elem.style.left = left + 'px';
}
x = 0;
},
indicate : function(elem){
if (elem == banner) {
self.activeClass(incBanner);
}else if (elem == center) {
self.activeClass(incCenter);
}
},
activeClass : function(elem){
var len = elem.children.length;
for (var i = 0; i < len; i++) {
elem.children[i].className=" ";
}
if (left == 0) {
elem.children[0].className = "active";
} else if (left == (-baseWidth)) {
elem.children[1].className = "active";
}else if (left == (-2*baseWidth)) {
elem.children[2].className = "active";
}
},
shiftBanner : function(elem){
var t = new Date();
var tmpLeft = parseInt(elem.style.left);
timer = setInterval(function(){
if ((tmpLeft == 0) || (tmpLeft == -baseWidth)) {
elem.style.left = tmpLeft - baseWidth + 'px';
} else if (tmpLeft == -2*baseWidth) {
elem.style.left = 0 + 'px';
}
tmpLeft = parseInt(elem.style.left);
left = tmpLeft;
// console.log(elem.style.left);
// console.log(t);
self.indicate(banner);
},4000);
},
addHandler : function(element, type, handler){
if (element.addEventListener) {
element.addEventListener(type, handler, true);
} else if (element.attachEvent) {
element.attachEvent("on" + type, handler);
} else {
element["on" + type] = handler;
}
}
};
return {
init : function(){
app.init();
}
};
});可以在浏览器中打开： https://iove1123.github.io/policy
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