Demo - 演示地址：http://a-1.vip/demo/exercise
Demo - 原生js 轮播图：http://a-1.vip/demo/slideshow
// 拖拽方法
// 当鼠标被按下、
demo.onmousedown = function(coord) {
// 判断为鼠标左键、
if (coord.button == 0) {
var _this = this;
// 当鼠标移动、
document.onmousemove = function(e) {
_this.style.left = e.pageX - coord.offsetX + 'px';
_this.style.top = e.pageY - coord.offsetY + 'px';
}
// 当鼠标抬起、
document.onmouseup = function() {
document.onmousemove = null;
document.onmouseup = null;
// startMove(_this);
}
}
}
//························································································
// 匀速运动
function balanceSports(event, speed, locX, locY) {
clearInterval(event.timer);
locX = locX - event.offsetLeft > 0 ? locX - event.offsetWidth : locX;
locY = locY - event.offsetTop > 0 ? locY - event.offsetHeight : locY;
var spX = locX - event.offsetLeft > 0 ? speed : -speed;
var spY = locY - event.offsetTop > 0 ? speed : -speed;
event.timer = setInterval(function() {
if (Math.abs(locX - event.offsetLeft) < Math.abs(spX) && Math.abs(locY - event.offsetTop) < Math.abs(spY)) {
clearInterval(event.timer);
} else if (Math.abs(locX - event.offsetLeft) < Math.abs(spX)) {
spX = 0;
event.style.left = locX + 'px';
} else if (Math.abs(locY - event.offsetTop) < Math.abs(spY)) {
spY = 0;
event.style.top = locY + 'px';
} else {
event.style.left = event.offsetLeft + spX + 'px';
event.style.top = event.offsetTop + spY + 'px';
}
}, 10);
}
// 缓冲运动
function bufferSports(event, speed, locX, locY) {
clearInterval(event.timer);
locX = locX - event.offsetLeft > 0 ? locX - event.offsetWidth : locX;
locY = locY - event.offsetTop > 0 ? locY - event.offsetHeight : locY;
event.timer = setInterval(function() {
var spX = (locX - event.offsetLeft) / speed;
spX = spX > 0 ? Math.ceil(spX) : Math.floor(spX);
var spY = (locY - event.offsetTop) / speed;
spY = spY > 0 ? Math.ceil(spY) : Math.floor(spY);
if (locX - event.offsetLeft == 0 && locY - event.offsetTop == 0) {
clearInterval(event.timer);
} else {
event.style.left = event.offsetLeft + spX + 'px';
event.style.top = event.offsetTop + spY + 'px';
}
}, 10)
}
多属性变化·运动实例：http://a-1.vip/demo/exercise/index2.html
// 支持多个属性动态变化,缓冲运动 bufferMove(元素，属性对象，速度，回调函数)
// bufferMove(this, {top: '150px',left: '300px',width: '600px',height: '600px',opacity: '0.05'}, 17, function() {console.log('Hello World~');});
function bufferMove(event, attrObj, speed, callback) {
// 兼容写法：取style样式属性、
function getStyle(dom, attr) {
if (window.getComputedStyle) {
return window.getComputedStyle(dom, null)[attr];
} else {
return dom.currentStyle[attr];
}
}
// 每次执行时结束上一次的定时器、
clearInterval(event.timer);
var peed = null, // 每次运动的速度、
current = null, // 当前位置、
target = null; // 终点位置、
event.timer = setInterval(function() {
var trigger = true;
for (var key in attrObj) {
if (key == 'opacity') {
target = parseFloat(attrObj[key]) * 100;
current = parseFloat(getStyle(event, key)) * 100;
} else {
target = parseFloat(attrObj[key]);
current = parseInt(getStyle(event, key));
}
peed = (target - current) / speed;
peed = peed > 0 ? Math.ceil(peed) : Math.floor(peed);
if (key == 'opacity') {
event.style[key] = (current + peed) / 100;
} else {
event.style[key] = current + peed + 'px';
}
if (target != current) {
trigger = false;
}
}
if (trigger) {
clearInterval(event.timer);
typeof(callback) === 'function' ? callback(): null; // 回调函数、
}
}, 20)
}
// 支持多个属性动态变化,弹性运动 elasticMove(元素，属性对象，回调函数)
// elasticMove(this, {top: '150px',left: '300px',width: '600px',height: '600px',opacity: '0.05'}, 17, function() {console.log('Hello World~');});
function elasticMove(event, attrObj, callback) {
// 兼容写法：取style样式属性、
function getStyle(dom, attr) {
if (window.getComputedStyle) {
return window.getComputedStyle(dom, null)[attr];
} else {
return dom.currentStyle[attr];
}
}
// 每次执行时结束上一次的定时器、
clearInterval(event.timer);
var f = 11, // 力度、
m = 0.85; // 阻力、
var speed = [];
for (var key in attrObj) {
speed[key] = 0;
}
event.timer = setInterval(function() {
var trigger = true;
for (var key in attrObj) {
trigger = false;
if (key == 'opacity') {
target = parseFloat(attrObj[key]) * 100;
current = parseFloat(getStyle(event, key)) * 100;
} else {
target = parseFloat(attrObj[key]);
current = parseInt(getStyle(event, key));
}
var a = (target - current) / f;
speed[key] += a;
speed[key] *= m;
if (key == 'opacity') {
event.style[key] = (current + speed[key]) / 100;
} else {
event.style[key] = current + speed[key] + 'px';
}
if (Math.abs(speed[key]) < 1 && Math.abs(target - current) < 1) {
event.style[key] = attrObj[key];
delete attrObj[key];
break;
}
}
if (trigger) {
clearInterval(event.timer);
typeof(callback) === 'function' ? callback(): null; // 回调函数、
}
}, 25)
}
模拟重力场·拖拽实例：http://a-1.vip/demo/exercise/index3.html
// 模拟重力场，弹性运动。startMove(元素对象, speedX, speedY)
function startMove(event, speedX, speedY) {
var g = 3;
clearInterval(event.timer);
event.timer = setInterval(function() {
speedY += g;
var newLeft = event.offsetLeft + speedX;
var newTop = event.offsetTop + speedY;
var dom = document.documentElement;
// console.log(dom.clientHeight - event.clientHeight - newTop, dom.clientHeight, event.offsetHeight);
// 判断event元素是否到顶边、
if (newTop <= 0) {
speedY *= -1;
speedX *= 0.8;
speedY *= 0.8;
newTop = 0;
}
// 判断event元素是否到左边、
if (newLeft <= 0) {
speedX *= -1;
speedX *= 0.8;
speedY *= 0.8;
newLeft = 0;
}
// 判断event元素是否到底边、
if (newTop >= dom.clientHeight - event.clientHeight) {
speedY *= -1;
speedX *= 0.8;
speedY *= 0.8;
newTop = dom.clientHeight - event.clientHeight;
}
// 判断event元素是否到右边、
if (newLeft >= dom.clientWidth - event.clientWidth) {
speedX *= -1;
speedX *= 0.8;
speedY *= 0.8;
newLeft = dom.clientWidth - event.clientWidth;
}
// 判断是否接近于0、
speedX = Math.abs(speedX) < 1 ? 0 : speedX;
speedY = Math.abs(speedY) < 1 ? 0 : speedY;
// 判断是否结束、
if (speedX == 0 && speedY == 0 && newTop == dom.clientHeight - event.clientHeight) {
clearInterval(event.timer);
} else {
event.style.left = newLeft + 'px';
event.style.top = newTop + 'px';
}
}, 20);
}
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