var num;
//定义数组
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];
//给num赋值为记录总数
num=492 ;
function givevalue(myvalue){
document.form1.city.length = 0;
for (var i=0;i < num; i++){
if (a[i][2] == myvalue){
document.form1.city.options[document.form1.city.length] = new Option(a[i][1], a[i][0],"","");
}}}