关系管理系统:js代码生成select的出生日期

//page初始调用

function pageInit()
{makeYear();makeMonth();makeDay();}
//产生Year
function makeYear(){var year = document.getElementById("year");for(var i=1901;i<=new Date().getYear();i++){var option = document.createElement("option");option.value = i;option.innerText = i;year.appendChild(option);}
}
//产生Month
function makeMonth()
{var month = document.getElementById("month");for(var i=2;i<=12;i++){var option = document.createElement("option");if(i<10){option.value = '0' + i;option.innerText = '0' + i;}else{option.value = i;option.innerText = i;}month.appendChild(option);}
}
//产生day日
function makeDay()
{var day = document.getElementById("day");for(var i=2;i<=31;i++){var option = document.createElement("option");if(i<10){option.value = '0' + i;option.innerText = '0' + i;}else{option.value = i;option.innerText = i;}day.appendChild(option);}
}function dosubmit()
{makeBirthday();makePreference();return true;
}
//合成出生日期
function makeBirthday(){var year = document.getElementById("year").value;var month = document.getElementById("month").value;var day = document.getElementById("day").value;var birthday = year + "-" + month + "-" + day;var input = document.createElement("input");input.type="hidden";input.name = "birthday";input.value = birthdaydocument.getElementById("customer").appendChild(input);}
//合成爱好单选项
function makePreference()
{var preference = "";var pres = document.getElementsByName("pre");for(var i=0;i){if(pres[i].checked==true){preference = preference + pres[i].value + ",";}}preference = preference.substr(0,preference.length-1);    var input = document.createElement("input");input.type = "hidden";input.name = "preference";input.value=preference;document.getElementById("customer").appendChild(input);}