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復制代碼 代碼如下:
function Animate(el, prop, opts) {
this.el = el;
this.prop = prop;
this.from = opts.from;
this.to = opts.to;
this.time = opts.time;
this.callback = opts.callback;
this.animDiff = this.to - this.from;
}
Animate.prototype._setStyle = function(val) {
switch(this.prop) {
case 'opacity':
this.el.style[this.prop] = val;
this.el.style.filter = 'alpha(opacity=' + val * 100 + ')';
break;
default:
this.el.style[this.prop] = val + 'px';
break;
}
}
Animate.prototype._animate = function() {
var that = this;
this.now = new Date();
this.diff = this.now - this.startTime;
if (this.diff > this.time) {
this._setStyle(this.to);
if (this.callback) {
this.callback.call(this);
}
clearInterval(this.timer);
return;
}
this.percentage = (Math.floor((this.diff / this.time) * 100) / 100);
this.val = (this.animDiff * this.percentage) + this.from;
this._setStyle(this.val);
}
Animate.prototype.start = function() {
var that = this;
this.startTime = new Date();
clearInterval(this.timer);
this.timer = setInterval(function() {
that._animate.call(that);
}, 4);
}
Animate.canTransition = function() {
var el = document.createElement('foo');
el.style.cssText = '-webkit-transition: all .5s linear;';
return !!el.style.webkitTransitionProperty;
}();
使用方法
復制代碼 代碼如下:
// 透明度漸變
function changeOpacity() {
// 透明度漸變 從1 - 0 漸變時間1000ms
var fx = 'opacity', from = 1, to = 0, time = 1000;
// 漸變完畢執行的回調函數
var callback = function() {
from = 0; to = 1;
new Animate(demo, fx, { from: from, to: to, time: time, callback: resetButton}).start();
}
// 實例化漸變函數
new Animate(demo, fx, {
from: from,
to: to,
time: time,
callback: callback
}).start();
}
演示代碼:
[Ctrl+A 全選 注:如需引入外部Js需刷新才能執行]
JavaScript技術：javascript簡易動畫類(div漸變)，轉載需保留來源！
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