JavaScript常用工具函数封装：Cookie、事件、拖拽与动画

JavaScript常用工具函数封装：Cookie、事件、拖拽与动画

以下整理了一些前端开发中高频使用的功能模块，此处不再赘述背景，读者可直接参考后续代码实现。

具体代码实现如下：

// Cookie操作模块
function setCookie(name, value, iDay)
{
if(iDay!==false)
    {
var oDate=new Date();
oDate.setDate(oDate.getDate()+iDay);
document.cookie=name+'='+value+';expires='+oDate+';path=/';
    }
else
    {
document.cookie=name+'='+value;
    }
}
function getCookie(name)
{
var arr=document.cookie.split('; ');
var i=0;
for(i=0;i<arr.length;i++)
    {
var arr2=arr[i].split('=');
if(arr2[0]==name)
        {
return arr2[1];
        }
    }
return '';
}
function removeCookie(name)
{
setCookie(name, 'a', -1);
}
事件绑定与解绑处理// 事件处理模块
function myAddEvent(obj, ev, fn){
obj.attachEvent?obj.attachEvent('on'+ev, fn):obj.addEventListener(ev, fn, false);
}
function myDelEvent(obj, ev, fn){
obj.detachEvent?obj.detachEvent('on'+ev, fn):obj.removeEventListener(ev, fn, false);
}
function getByClass(oParent, sClass)
{
var aEle=oParent.getElementsByTagName('*');
var re=new RegExp('\\b'+sClass+'\\b', 'i');
var aResult=[];
for(var i=0;i<aEle.length;i++)
    {
if(re.test(aEle[i].className))
        {
aResult.push(aEle[i]);
        }
    }
return aResult;
}
function bindEvent(obj, ev, fn)
{
obj.addEventListener?obj.addEventListener(ev, fn, false):obj.attachEvent('on'+ev, fn);
}
function unbindEvent(obj, ev, fn)
{
obj.removeEventListener?obj.removeEventListener(ev, fn, false):obj.detachEvent('on'+ev, fn);
}
// 基础数学与时间处理
function rnd(n, m)
{
return Math.random()*(m-n)+n;
}
function time2date(t)
{
function d(n){return n<10?'0'+n:''+n;}
var oDate=new Date(t*1000);
return oDate.getFullYear()+'-'+d(oDate.getMonth()+1)+'-'+d(oDate.getDate())+' '+d(oDate.getHours())+':'+d(oDate.getMinutes())+':'+d(oDate.getSeconds());
}
function time2day(t)
{
function d(n){return n<10?'0'+n:''+n;}
var oDate=new Date(t*1000);
return oDate.getFullYear()+'-'+d(oDate.getMonth()+1)+'-'+d(oDate.getDate());
}
鼠标拖拽与滚轮监听实现// 拖拽交互模块
function drag(objEv, objMove, fnMoveCallBack)
{
var disX=0,disY=0;
objEv.onmousedown=function (ev)
    {
var oEvent=ev||event;
disX=(document.documentElement.scrollLeft||document.body.scrollLeft)+oEvent.clientX-objMove.offsetLeft;
disY=(document.documentElement.scrollTop||document.body.scrollTop)+oEvent.clientY-objMove.offsetTop;
if(objEv.setCapture)
        {
objEv.onmousemove=fnMove;
objEv.onmouseup=fnUp;
objEv.setCapture();
        }
else
        {
document.onmousemove=fnMove;
document.onmouseup=fnUp;
return false;
        }
    };
function fnMove(ev)
    {
var oEvent=ev||event;
var l=(document.documentElement.scrollLeft||document.body.scrollLeft)+oEvent.clientX-disX;
var t=(document.documentElement.scrollTop||document.body.scrollTop)+oEvent.clientY-disY;
fnMoveCallBack(l,t);
    }
function fnUp()
    {
this.onmousemove=null;
this.onmouseup=null;
if(this.releaseCapture)this.releaseCapture();
    }
}
function mouseScroll(obj, fnCallBack)
{
bindEvent(obj, 'mousewheel', fnScroll);
bindEvent(obj, 'DOMMouseScroll', fnScroll);
function fnScroll(ev)
    {
var oEvent=ev||event;
var bDown;
if(oEvent.wheelDelta)
        {
bDown=oEvent.wheelDelta<0;
        }
else
        {
bDown=oEvent.detail>0;
        }
fnCallBack(bDown);
if(oEvent.preventDefault)oEvent.preventDefault();
return false;
    }
}
摆动与弹性运动算法// 摆动运动算法
zns.site.fx.swing=function (obj, cur, target, fnDo, fnEnd, acc)
{
if(zns.site.fx.browser_test.IE6)
    {
fnDo&&fnDo.call(obj, target);
fnEnd&&fnEnd.call(obj, target);
return;
    }
if(!acc)acc=0.1;
var now={};
var x=0; //0-100
if(!obj.__swing_v)obj.__swing_v=0;
if(!obj.__last_timer)obj.__last_timer=0;
var t=new Date().getTime();
if(t-obj.__last_timer>20)
    {
fnMove();
obj.__last_timer=t;
    }
clearInterval(obj.timer);
obj.timer=setInterval(fnMove, 20);
function fnMove(){
if(x<50)
        {
obj.__swing_v+=acc;
        }
else
        {
obj.__swing_v-=acc;
        }
//if(Math.abs(obj.__flex_v)>MAX_SPEED)obj.__flex_v=obj.__flex_v>0?MAX_SPEED:-MAX_SPEED;
x+=obj.__swing_v;
//alert(x+','+obj.__swing_v);
for(var i in cur)
        {
now[i]=(target[i]-cur[i])*x/100+cur[i];
        }
if(fnDo)fnDo.call(obj, now);
if(/*Math.abs(obj.__swing_v)<1 || */Math.abs(100-x)<1)
        {
clearInterval(obj.timer);
if(fnEnd)fnEnd.call(obj, target);
obj.__swing_v=0;
        }
    }
};
// 弹性运动算法
zns.site.fx.flex=function (obj, cur, target, fnDo, fnEnd, fs, ms)
{
if(zns.site.fx.browser_test.IE6)
    {
fnDo&&fnDo.call(obj, target);
fnEnd&&fnEnd.call(obj, target);
return;
    }
var MAX_SPEED=16;
if(!fs)fs=6;
if(!ms)ms=0.75;
var now={};
var x=0; //0-100
if(!obj.__flex_v)obj.__flex_v=0;
if(!obj.__last_timer)obj.__last_timer=0;
var t=new Date().getTime();
if(t-obj.__last_timer>20)
    {
fnMove();
obj.__last_timer=t;
    }
clearInterval(obj.timer);
obj.timer=setInterval(fnMove, 20);
function fnMove(){
obj.__flex_v+=(100-x)/fs;
obj.__flex_v*=ms;
if(Math.abs(obj.__flex_v)>MAX_SPEED)obj.__flex_v=obj.__flex_v>0?MAX_SPEED:-MAX_SPEED;
x+=obj.__flex_v;
for(var i in cur)
        {
now[i]=(target[i]-cur[i])*x/100+cur[i];
        }
if(fnDo)fnDo.call(obj, now);
if(Math.abs(obj.__flex_v)<1 && Math.abs(100-x)<1)
        {
clearInterval(obj.timer);
if(fnEnd)fnEnd.call(obj, target);
obj.__flex_v=0;
        }
    }
};