Dom元素变换效果（工具函数）_javascript技巧

用js来控制行为，控制页面表现。恐怕是我们用它来做的最多的事情了...
　　jQuery为什么这么受欢迎，我想，一方面是它的选择器[selector]足够牛B，另一方面应该要归功于它在dom变换上做足了功夫。
　　于是，秉承着一个宅男的宗旨，周末花了两个晚上稍微总结了一下，写了一段控制dom元素变换的代码，与目前强大的框架比起来，确实显得有点拙劣，不过作为日常开发的工具函数，我想还是蛮实用的。（这也是我最初的目的 ^_^）。
　　开门见山，先把源码完整的贴出来：（本着分享学习的原则，源代码你可以任意修改）

复制代码 代码如下:

//////////////* = Hongru.anim.js =*///////////
// @author: hongru.chen //
// @date: 2010-10-17 //
////////////////////////////////////////////
var Hongru = {
get : function (id) {return document.getElementById(id)},
tween : {
linear : function (f, t, d) { return t * d + f; },
ease : function (f, t, d) { return -t * .5 * (Math.cos(Math.PI * d) - 1) + f; }
},
tweens: [],
tweensCnt: 0,
anim : function (obj, params) {
var self = this,
objList = [],
objReturn = [];
var animimg = function () {
var i = -1, o;
while( o = self.tweens[++i] ) {
var cTime = (new Date()).getTime() - o.start;
if (cTime for (var k in o.val) {
var m = o.val[k];
o.obj[k] = Math.ceil(o.ease(m.from, m.diff, cTime/o.duration)) + (o.cssMode ? 'px' : 0);
}
} else {
cTime = o.duration;
for (var k in o.val) {
var m = o.val[k];
o.obj[k] = Math.ceil(o.ease(m.from, m.diff, cTime/o.duration)) + (o.cssMode ? 'px' : 0);
}
self.tweens.splice(i, 1);
self.tweensCnt--;
if (o.onFinish) o.onFinish (o.params);
self.stop();
}
if (!o.cssMode) o.obj.onTween();
}
};
if (typeof obj == "string" || !obj.length) objList.push(obj); else objList = obj;
for (var il = 0, l = objList.length; il var obj = this.get(objList[il]) || objList[il];
var o = {};
o.val = {};
o.cssMode = true;
o.o = obj;
o.obj = obj.style;
for (var k in params) {
var p = params[k];
if (k === "cssMode") {
if (p === false) {
o.cssMode = false;
o.obj = obj;
}
} else if (k === "onTween") {
o.obj.onTween = p;
} else if (k === "from") {
for (var i in p) o.obj[i] = o.cssMode ? (Math.ceil(p[i]) + 'px') : p[i];
} else if (k === "to") {
for (var i in p) {
var from = o.cssMode ? (parseInt(o.obj[i]) || 0) : (o.obj[i] || 0);
o.val[i] = {
from: from,
diff: p[i] - from
};
}
} else o[k] = params[k];
}
if (!o.ease) o.ease = this.tween.ease;
if (!o.cssMode && params['from']) o.obj.onTween();
o.duration = params.duration ? params.duration : 1000;
o.start = (new Date()).getTime();
this.tweens.push(o);
this.tweensCnt++;
if (!this.running) this.running = window.setInterval(animimg, 10);
objReturn.push(o);
}
return objReturn.length === 1 ? o : objReturn;
},
stop : function () {
if (!this.tweensCnt) {
window.clearInterval(this.running);
this.running = false;
}
},
kill : function (obj) {
if (obj) {
for (var i = 0; i if (this.tweens[i] === obj || this.tweens[i].o === obj || this.tweens[i].o === this.get(obj)) {
this.tweensCnt--;
this.tweens.splice(i, 1);
this.stop();
}
}
}
},
reset : function () {
this.tweensCnt = 0;
this.stop();
while( this.tweens.length ) {
this.tweens.stop();
}
}
}

从调用方式来看，其实我的实现方法有点类似于YUI，以下是个最简单的例子：

复制代码 代码如下:

Hongru.anim(id, {
from: {
top: 0,
left: 100
},
to: {
left: 500,
}
});

以下是调用这段代码的效果：

<meta http-equiv="Content-type" content="text/html; charset=gb2312"> <title>Tweens demo</title> <script type="text/javascript">//////////////* = Hongru.anim.js =*/////////// // @author: hongru.chen // // @date: 2010-10-17 // //////////////////////////////////////////// var Hongru = { get : function (id) {return document.getElementById(id)}, tween : { linear : function (f, t, d) { return t * d + f; }, ease : function (f, t, d) { return -t * .5 * (Math.cos(Math.PI * d) - 1) + f; } }, tweens: [], tweensCnt: 0, anim : function (obj, params) { var self = this, objList = [], objReturn = []; var animimg = function () { var i = -1, o; while( o = self.tweens[++i] ) { var cTime = (new Date()).getTime() - o.start; if (cTime < o.duration) { for (var k in o.val) { var m = o.val[k]; o.obj[k] = Math.ceil(o.ease(m.from, m.diff, cTime/o.duration)) + (o.cssMode ? 'px' : 0); } } else { cTime = o.duration; for (var k in o.val) { var m = o.val[k]; o.obj[k] = Math.ceil(o.ease(m.from, m.diff, cTime/o.duration)) + (o.cssMode ? 'px' : 0); } self.tweens.splice(i, 1); self.tweensCnt--; if (o.onFinish) o.onFinish (o.params); self.stop(); } if (!o.cssMode) o.obj.onTween(); } }; if (typeof obj == "string" || !obj.length) objList.push(obj); else objList = obj; for (var il = 0, l = objList.length; il < l; il++) { var obj = this.get(objList[il]) || objList[il]; var o = {}; o.val = {}; o.cssMode = true; o.o = obj; o.obj = obj.style; for (var k in params) { var p = params[k]; if (k === "cssMode") { if (p === false) { o.cssMode = false; o.obj = obj; } } else if (k === "onTween") { o.obj.onTween = p; } else if (k === "from") { for (var i in p) o.obj[i] = o.cssMode ? (Math.ceil(p[i]) + 'px') : p[i]; } else if (k === "to") { for (var i in p) { var from = o.cssMode ? (parseInt(o.obj[i]) || 0) : (o.obj[i] || 0); o.val[i] = { from: from, diff: p[i] - from }; } } else o[k] = params[k]; } if (!o.ease) o.ease = this.tween.ease; if (!o.cssMode && params['from']) o.obj.onTween(); o.duration = params.duration ? params.duration : 1000; o.start = (new Date()).getTime(); this.tweens.push(o); this.tweensCnt++; if (!this.running) this.running = window.setInterval(animimg, 10); objReturn.push(o); } return objReturn.length === 1 ? o : objReturn; }, stop : function () { if (!this.tweensCnt) { window.clearInterval(this.running); this.running = false; } }, kill : function (obj) { if (obj) { for (var i = 0; i < this.tweensCnt; i++) { if (this.tweens[i] === obj || this.tweens[i].o === obj || this.tweens[i].o === this.get(obj)) { this.tweensCnt--; this.tweens.splice(i, 1); this.stop(); } } } }, reset : function () { this.tweensCnt = 0; this.stop(); while( this.tweens.length ) { this.tweens.stop(); } } }</script> <style type="text/css"><!-- .container{height:200px;border:4px solid #ccc;position:relative;margin-bottom:10px} ul,li{margin:0;padding:0} --></style> <script type="text/javascript"><!-- function tween1 (id) { //姝</script>