小米抢购时的JS代码，分析一下吧，返回的ajax代码:
hdcontrol({"stime":1381645438,"status":{"allow":false,"miphone":{"hdstart":false,"hdstop":false,"hdurl":"","duration":null},"mibox":{"hdstart":false,"hdstop":false,"hdurl":"","duration":null}}})
function forNum(a){
return 10>a?"0"+a:a
}
function countdown(a,b){
var c=new Date(b).getTime()/1e3,
d=c-a,
e=parseInt(d%60),
f=parseInt(d/60%60),g=parseInt(d/3600%24),
h=parseInt(d/3600/24),
i=[e.toString(),
f.toString(),
g.toString()];
return 0>=d?["00小时00分00秒",!0]:h>0?(window._timestr=h+"天"+forNum(i[2])+"时"+forNum(i[1])+"分"+forNum(i[0])+"秒",[h+"<span>天</span>"+forNum(i[2])+"<span>时</span>"+forNum(i[1])+"<span>分</span>"+forNum(i[0])+"<span>秒</span>",!1]):(window._timestr=forNum(i[2])+"时"+forNum(i[1])+"分"+forNum(i[0])+"秒",[forNum(i[2])+"<span>时</span>"+forNum(i[1])+"<span>分</span>"+forNum(i[0])+"<span>秒</span>",!1])}
function WebEventTrigger(a,b){
try{
if(WE&&WE.trigger)
return"string"!=typeof b&&(b=JSON.stringify(b)),WE.trigger(a,b)
}catch(c){}
return!1
}
function isApp(){
try{
if(WE)return!0
}catch(a){}
return!1
}
var quickBuy={init:function(){
var a=this;
this.config={},
this.config.hdurl={miphone:"m3/840410D8656D74E5F334591BD8A408A726799AEC13477D90B5E48DAD36547351/4334F49A1EE391261005E8AC5A0C9D2FDA23BB72A2D20AB3F58343496FD4983D/tip_SaledOverAll.html",mibox:"tv/B1CF7B57BFEAE1EBC37700694C123D894C668BF11F6F25D59311FD36942B3D6A/130F1B18D11F53CA1D0147B24E926C5A9B7676E57BE3D47959D6557545E8A339/tip_SaledOverAll.html"
},
this.config.mode="",
this.mode={miphone:!1,mibox:!1},
this.modeModals={miphone:"#modal_miphone",mibox:"#modal_mibox"},
this.modeCookies={miphone:"xm_hd_so_phone",mibox:"xm_hd_so_box"},
this.config.startDate=+new Date("10/15/2013 12:00:00"),
this.maskLoad=$("#maskLoad"),
this.config.minSignTime=120,
this.results=null,
this.timer=null,
this.timeCount=Math.floor(Math.abs(10*Math.random()-5))+5;
var b=!0;
for(var c in this.mode)
$.cookie(this.modeCookies[c])||(b=!1),$.cookie(this.modeCookies[c])&&this.saleOut();
b||($.cookie("xm_diff_hd")?(this.config.serverTime=this.localTime()+parseInt($.cookie("xm_diff_hd"),10),this.config.serverTime>=parseInt(this.config.startDate/1e3,10)?$.cookie("xm_hd_so_phone")&&$.cookie("xm_hd_so_box")||this.getData(!0,function(){a.goBuy()}):this.launch()):this.getData())},getData:function(a,b){
var c=this,a=a||null;
b&&(b=b),
$.ajax({
",
dataType:"jsonp",
jsonpCallback:"hdcontrol",
timeout:7e3,
beforeSend:function(){
c.maskLoad.css("display","block")},
error:function(){
c.maskLoad.css("display","none"),
alert("服务器压力山大，请您重新刷新页面！")
},
success:function(d){
if(c.maskLoad.css("display","none"),"undefined"==typeof d)
return alert("服务器压力山大，请您重新刷新页面！"),
void 0;
if(c.results=d,a||(c.config.serverTime=c.results.stime),!$.cookie("xm_diff_hd")){
var e=parseInt(c.config.serverTime-c.localTime(),10);
$.cookie("xm_diff_hd",e,{
path:"//www.submisscin.com/wap/",
domain:".xiaomi.com",
expires:1
})
}
if(a){
c.initialData();
for(var f in c.mode)
if(c.config[f].hdstart===!1&&c.config[f].hdstop===!0){
var g=c.modeCookies[f];
$.cookie(g,1,{path:"//www.submisscin.com/wap/",domain:".xiaomi.com",expires:1}),
c.saleOut()
}else b&&b.call()
}
a||c.launch()
}})},
initialData:function(){
this.config.allow=this.results.status.allow,
this.config.mibox=this.results.status.mibox,
this.config.miphone=this.results.status.miphone
},
launch:function(){
this.timeStart(),
this.countdown()
},
timeStart:function(){
var a=this,
b=1e3*a.config.serverTime,
c=a.config.startDate,
d=c-1e3*60*a.config.minSignTime;
b>=d&&c>b&&!isApp()?
$.cookie("userId")?
($("#view_button").css("visibility","hidden"),
$("#purchase_btn_1").html('<a href="" class="btn_buy">活动详情</a>'),
$("#purchase_btn_2").html('<a href="javascript:;" class="btn_buy btn_02">已经登录</a>')):a.toLogin():b>=c&&a.toBuy()
},
toLogin:function(){
$("#view_button").css("visibility","hidden"),
$("#purchase_btn_1").html('<a href="" class="btn_buy">活动详情</a>'),
$("#purchase_btn_2").html('<a href="javascript:;" class="btn_buy btn_02">提前登录</a>'),
$("#purchase_btn_2").find(".btn_02").on("click",function(){
WebEventTrigger("login",null)||(window.location.href="))}
)},
countdown:function(){
var a=this,
b=null,
c=a.config.startDate;
b=a.config.serverTime?a.config.serverTime:parseInt(+new Date/1e3,10);
var d=c-1e3*60*a.config.minSignTime,
e=setInterval(function(){
var f=countdown(b,c);
f[1]?(clearInterval(e),$("#countdown").css("display","none"),a.toBuy()):(1e3*b!=d||isApp()||($.cookie("userId")?($("#view_button").css("visibility","hidden"),
$("#purchase_btn_1").html('<a href="" class="btn_buy">活动详情</a>'),
$("#purchase_btn_2").html('<a href="javascript:;" class="btn_buy">已经登录</a>')):a.toLogin()),b++),
$("#countdown").html(f[0])},1e3)},
toBuy:function(){
var a=this;
a.goBuy();
var b=a.modeModals[a.config.mode];
$(b).find(".close").on("click",function(){
$(b).css("display","none"),
window.clearTimeout(a.timer),
a.timer=null})},
saleOut:function(){
var a={miphone:"#purchase_btn_2",mibox:"#purchase_btn_1"},
b={miphone:""},
c={miphone:"支付小米手机3",mibox:"支付小米电视"};
for(var d in this.mode)
$.cookie(this.modeCookies[d])&&($(a[d]).html('<a href="'+b[d]+'" class="btn_buy">'+c[d]+"</a>"),
$(this.modeModals[d]).is(":visible")&&$(this.modeModals[d]).find(".close").click())},
localTime:function(){
var a=parseInt(+new Date/1e3,10);
return a
},
toProcess:function(a){
var b=this,
c=b.timer,
d=b.timeCount||10,e=$(b.modeModals[a]).find(".re_countdown"),
f=$(b.modeModals[a]).find(".modal_btn"),
g=function(){0==d?(f.html('<a href="javascript:;" class="into_buy_btn">进入活动</a>'),
b.toBuyGo(b.config.mode),
c&&window.clearTimeout(c),
c=null):(e.html("("+d+")"),
d--,
b.timer=window.setTimeout(function(){g()},1e3))};
c&&window.clearTimeout(c),g()},
goBuy:function(){
var a=this,
b={miphone:"购买小米手机3",mibox:"购买小米电视"},
c={miphone:"#purchase_btn_2",mibox:"#purchase_btn_1"};
for(var d in a.mode)
$.cookie(a.modeCookies[d])||($(c[d]).html('<a href="javascript:;" class="btn_buy btn_buy_go" data-type="'+d+'">'+b[d]+"</a>"),
$(c[d]).is(":hidden")&&$(c[d]).css("display","block"));
$("#open_button").find(".btn_buy_go").on("click",function(){a.mode[$(this).attr("data-type")]=!0;
var b=a.config.mode=$(this).attr("data-type");
if($.cookie("userId"))a.getData(!0,function(){
$(a.modeModals[b]).css("display","block"),
$(a.modeModals[b]).find(".close").on("click",function(){
$(a.modeModals[b]).css("display","none"),window.clearTimeout(a.timer),a.timer=null}),a.toProcess(b)});
else{if(WebEventTrigger("login",null))return;
window.location.href=")}})},
toBuyGo:function(a){
var b=this;
window.clearTimeout(b.timer),
b.timer=null,
$(b.modeModals[a]).find(".modal_btn").find(".into_buy_btn").on("click",function(c){c.preventDefault(),b.getData(!0,function(){
if($(b.modeModals[a]).css("display","block"),b.config.allow)if(b.config[a].hdurl){
var c="";
window.setTimeout(function(){window.location.href=c},500)
}else{
var d="];
window.setTimeout(function(){window.location.href=d},500)
}else if(
b.config[a].hdstart===!1&&b.config[a].hdstop===!0){
var d="];
window.setTimeout(function(){window.location.href=d},500)
}else $(b.modeModals[a]).find(".modal_btn").html('<a href="javascript:;" class="re_enter">重新进入<span class="re_countdown"></span></a>'),
b.toProcess(a)
})})}};
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