写个东西没写出来

2008-10-26 10:40:39 104 阅读 AI 写同款 · GEO 优化AI 选题数据监测一键分发 ›

R语言，charls数据库清洗、基线特征描述、logistics回归、rcs模型、森林图【代码】R语言，charls数据库清洗、基线特征描述、logistics回归、rcs模型、森林图。阅读详情

看到有人要年，月，日的联动菜单
于是想写一个
结果没写出来，并出现的了我无法理解的问题．
同样是一个对象的方法　　一个可以alert出属性　　一个却alert出来的是null．．．．．　　－　－！
问题所在的地方代码中有说明
我想知道怎么去理解这个东西　　请大虾们指教下　　

<script>

function Calendar(startyear,endyear){

this.year = new Array()

var j=0

for(var i = startyear;i<=endyear;i++)

{this.year[j]=i;

 j++}



this.month=[1,2,3,4,5,6,7,8,9,10,11,12]



this.day=[[1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31],[1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28],[1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31],[1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30],[1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31],[1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30],[1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31],[1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31],[1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30],[1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31],[1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30],[1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31]]

}

Calendar.prototype.Createselect=function(){

var sele1 = document.createElement("select") 

sele1.id="year"

document.body.appendChild(sele1)

var sele2 = document.createElement("select") 

sele2.id="month"

document.body.appendChild(sele2)

var sele3 = document.createElement("select") 

sele3.id="day"

document.body.appendChild(sele3)

this.Isyear(this.year[0])

this.Initialization()

this.addmonth()

}



Calendar.prototype.Initialization=function(){

for(var i= 0;i<this.year.length;i++)

{document.getElementById("year").options.add(new Option(this.year[i],i))}

for(var i= 0;i<this.month.length;i++)

{document.getElementById("month").options.add(new Option(this.month[i],i))}

for(var i= 0;i<this.day[1].length;i++)

{document.getElementById("day").options.add(new Option(this.day[1][i],i))}

alert(this.day[1])  // 这里出来的是那个数组的东西。。

}



Calendar.prototype.Isyear = function(year){

if (0==year%4&&((year%100!=0)||(year%400==0))) 

{this.day[1]=[1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29]} 

else 

{this.day[1]=[1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28]}

}



Calendar.prototype.addyear = function(year){

var obj = document.getElementsById("year")

obj.attachEvent("onchange",this.changeyear)

}



Calendar.prototype.addmonth = function(year){

var obj = document.getElementById("month")

obj.attachEvent("onchange",this.changemonth)

}



Calendar.prototype.changemonth = function(){

document.getElementById("day").length=0

var nowday = this.day[event.srcElement.value]

alert(this.day[1]) //  这里alert出来的是 null

}





window.onload=function(){

var c = new Calendar(2007,2009)

c.Createselect()

}



</script>