我有一个代码示例，我想从输入字段读取一些数据并将该数据写入另一个div。
在第一部分中，代码正常工作，但在第二部分中，该值未显示。我使用alert函数检查是否收到了值。收到的值但未显示。
我的代码出了什么问题？ （下同）
function preview() {
$(".preview_block").fadeIn(1000);
$("body").css("overflow","hidden");
$(".preview_block").css("overflow","auto");
/*======================Value fetch for personal details=======================*/
var fastname1 = document.forms["myform"]["fastname"].value;
if(fastname1==""){fastname1="---null---"}
var lastname1 = document.forms["myform"]["lastname"].value;
if(lastname1==""){lastname1="---null---"}
var sex1 = document.forms["myform"]["radio"].value;
if(sex1==""){sex1="---null---"}
var clgid1 = document.forms["myform"]["clgid"].value;
if(clgid1==""){clgid1="---null---"}
var dob1 = document.forms["myform"]["dob"].value;
if(dob1==""){dob1="---null---"}
var fname1 = document.forms["myform"]["fname"].value;
if(fname1==""){fname1="---null---"}
var mname1 = document.forms["myform"]["mname"].value;
if(mname1==""){mname1="---null---"}
var gname1 = document.forms["myform"]["gname"].value;
if(gname1==""){gname1="---null---"}
var mobno1 = document.forms["myform"]["mobno"].value;
if(mobno1==""){mobno1="---null---"}
var pmobno1 = document.forms["myform"]["pmobno"].value;
if(pmobno1==""){pmobno1="---null---"}
var mail1 = document.forms["myform"]["mail"].value;
if(mail1==""){mail1="---null---"}
var addr11 = document.forms["myform"]["addr1"].value;
if(addr11==""){addr11="---null---"}
var addr21 = document.forms["myform"]["addr2"].value;
if(addr21==""){addr21="---null---"}
var city1 = document.forms["myform"]["city"].value;
if(city1==""){city1="---null---"}
var state1 = document.forms["myform"]["state"].value;
if(state1==""){state1="---null---"}
var pcode1 = document.forms["myform"]["pcode"].value;
if(pcode1==""){pcode1="---null---"}
var ps1 = document.forms["myform"]["ps"].value;
if(ps1==""){ps1="---null---"}
var po1 = document.forms["myform"]["po"].value;
if(po1==""){po1="---null---"}
var country1 = document.forms["myform"]["country"].value;
if(country1==""){country1="---null---"}
document.getElementById("p1").innerHTML = fastname1;
document.getElementById("p2").innerHTML = lastname1;
document.getElementById("p3").innerHTML = sex1;
document.getElementById("p4").innerHTML = clgid1;
document.getElementById("p5").innerHTML = dob1;
document.getElementById("p6").innerHTML = fname1;
document.getElementById("p7").innerHTML = mname1;
document.getElementById("p8").innerHTML = gname1;
document.getElementById("p9").innerHTML = mobno1;
document.getElementById("p10").innerHTML = pmobno1;
document.getElementById("p11").innerHTML = mail1;
document.getElementById("p12").innerHTML = addr11;
document.getElementById("p13").innerHTML = addr21;
document.getElementById("p14").innerHTML = city1;
document.getElementById("p15").innerHTML = state1;
document.getElementById("p16").innerHTML = pcode1;
document.getElementById("p17").innerHTML = ps1;
document.getElementById("p18").innerHTML = po1;
document.getElementById("p19").innerHTML = country1;
/*======================Value fetch for XII standered details=======================*/
var qualification1 = $('#qualification option:selected').html();
if(qualification1==""){qualification1="---null---"}
var q1_board1 = $('#q1_board option:selected').html();
if(q1_board1==""){q1_board1="---null---"}
var clg_nm1 = document.forms["myform"]["clg_nm"].value;
if(session1==""){session1="---null---"}
var regno1 = document.forms["myform"]["regno"].value;
if(regno1==""){regno1="---null---"}
var yr_reg1 = document.forms["myform"]["yr_reg"].value;
if(yr_reg1==""){yr_reg1="---null---"}
var rollno1 = document.forms["myform"]["rollno"].value;
if(rollno1==""){rollno1="---null---"}
document.getElementById("q1").innerHTML = qualification1;
document.getElementById("q2").innerHTML = q1_board1;
document.getElementById("q3").innerHTML = clg_nm1;
document.getElementById("q4").innerHTML = regno1;
document.getElementById("q5").innerHTML = yr_reg1;
document.getElementById("q6").innerHTML = rollno1;
}