var zone=document.getElementById("zoneId");
var area=document.getElementById("areaId");
var build=document.getElementById("buildId");
var unit=document.getElementById("unitId");
var zoneName = zone.options[zone.selectedIndex].text;
var areaName = area.options[area.selectedIndex].text;
var buildName = build.options[build.selectedIndex].text;
var unitName = unit.options[unit.selectedIndex].text;
解析HTML DOM操作:元素获取与属性提取
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