发布于 2016-12-22 22:06:29 | 165 次阅读 | 评论: 0 | 来源: 网友投递
这里有新鲜出炉的Javascript教程，程序狗速度看过来！
JavaScript客户端脚本语言
Javascript 是一种由Netscape的LiveScript发展而来的原型化继承的基于对象的动态类型的区分大小写的客户端脚本语言，主要目的是为了解决服务器端语言，比如Perl，遗留的速度问题，为客户提供更流畅的浏览效果。
var $m = $M("divAnimate");
_("btnAnimate").onclick = function(){
this.disabled = true;
var that = this;
$m.animate({left:"300px",top:"100px",width:"300px", height:"200px",opacity:0.3},{duration:5000,easing:Tween.Back.easeInOut}).delay(200)
.animate({left:"50px",top:"300px",width:"150px",height:"100px",opacity:0.8},{duration:2000,easing:Tween.Elastic.easeInOut,
callback:function(){
that.disabled = false;
}
});
}
_("btnPause").onclick = function(){
$m.pause();
this.disabled = true;
_("btnResume").disabled = false;
}
_("btnResume").disabled = true;
_("btnResume").onclick = function(){
$m.resume();
this.disabled = true;
_("btnPause").disabled = false;
}
_("btnStop").onclick = function(){
$m.stop();
_("btnAnimate").disabled = false;
}
/* 简单动画方法
* 未实现单位换算
*/
var $M = function(obj){
var elem = ("string" === typeof obj )?document.getElementById(obj):obj;
var _this = {},props = {},timeId,isBusy = false,isPause = false;
var queue = [],_current;
//直线运动算法
function Linear(t,b,c,d){ return c*t/d + b;}
function setCss(className,value){
if(className == "opacity"){
if(document.defaultView){
elem.style["opacity"] = value;
} else {
elem.style["filter"] = 'alpha(opacity=' + 100 * value + ')';
}
} else {
elem.style[className] = value;
}
}
function getCss(className){
if(className == "opacity"){
var ret = "";
if(document.defaultView){
ret = document.defaultView.getComputedStyle(elem,null)['opacity'] || 1;
} else {
ret = elem.currentStyle['filter']?(elem.currentStyle['filter'].match(/^alpha\(opacity=([\d\.]+)\)$/))[1]/100 : 1;
}
return ret.toString();
} else {
return elem.style[className].toString();
}
}
function _move(params,easing,st,ht,callback){
var t = ((new Date()).getTime() - st);
_current.t = t;
if(isPause){return;}
easing = easing||Linear;
ht = ht || 500;
for(var p in params){
if(!props[p]){
var iv = parseFloat(getCss(p)) || 0;
var ev = parseFloat(params[p]);
props[p] = {
iv:iv,
iu:iv?getCss(p).substring(iv.toString().length):null,
ev:ev,
eu:params[p].toString().substring(ev.toString().length)
}
//TODO(初始值的单位和目标值的单位不相同需要处理)
}
if(t >= ht){t = ht;}
var nv = easing(t,props[p].iv,(props[p].ev - props[p].iv),ht);
nv = parseFloat(nv);
setCss(p,nv + props[p].eu);
}
if(t < ht){
timeId = setTimeout(function(){
_move(params,easing,st,ht,callback);
},13);
} else {
props = {};
isBusy = false;
if(callback){
callback();
}
run();
}
}
function run(){
if(!isBusy && queue.length != 0){
var o = queue.shift();
var _delay = 0;
while(o && o.delay){
_delay += o.delay;
o = queue.shift();
}
if(o){
_current = o;
isBusy = true;
setTimeout(function(){
var st = (new Date()).getTime();
_move(o.params,o.options.easing,st,o.options.duration,o.options.callback);
},_delay);
}
}
}
var _this = {
animate:function(params,options){
queue.push({params:params,options:options});
isPause = false;
run();
return _this;
},
delay:function(ms){
queue.push({delay:ms});
return _this;
},
pause:function(){
isPause = true;
return _this;
},
resume:function(){
if(_current){
var o = _current;
isPause = false;
var st = (new Date()).getTime() - _current.t;
_move(o.params,o.options.easing,st,o.options.duration,o.options.callback);
return _this;
}
},
stop:function(){
isPause = true;
isBusy = false;
queue = [];
props = {};
return _this;
}
};
return _this;
}