一行显示的问题

呵呵，那是因为你的Div的关系，div是块元素，里面包含的两个input当然会单独起行了
你不信可以把div的display:none换成block或去掉试试

解决方案 »

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form.Pr_name.style.display = "inline";// 把你的两个block都换成inline
换成下面的试试，如果要满足这个要求，不过你还可以直接隐藏元素<div>
        <form name="searchsoft" method="get" action="workerlist.asp">
            <input name="P_pass" type="radio" value="False" onClick="submit();" <%if P_pass="False" then response.write " checked"%>>
            在职员工    
            <input name="P_pass" type="radio" value="True" onClick="submit();" <%if P_pass="True" then response.write " checked"%>>
            离职员工
        </form>
        <form name="searchsoft" method="get" action="workerlist.asp">
            <div style="float:left">            <select name="xuanze" onChange="changeQuery();">
              <option value="1">姓名</option>
              <option value="2">籍贯</option>
              <option value="3">职业</option>
              <option value="4">入厂时间</option>
            </select>            <input name="Pr_name" type="text" size="12">
</div>
            <div id="datetime" style="display:none;float:left"><input name="Pr_name_1" type="text" size="12" onFocus="WdatePicker({isShowWeek:true})"/><input name="Pr_name_2" type="text" size="12" onFocus="WdatePicker({isShowWeek:true})"/>
            </div>
<div style="float:left">            <input name="Query" type="submit" value="查询">
</div>        </form>
    </div>
改两个地方：
[1]
function changeQuery() {
    var obj = event.srcElement;
    var form = obj.form;
    if (obj.options[obj.selectedIndex].value == "4") {
        form.Pr_name.style.display = "none";
        datetime.style.display = "block";
    } else {
        form.Pr_name.style.display = "block";
        datetime.style.display= "none";
    }
}
改成
function changeQuery() {
    var obj = event.srcElement;
    var form = obj.form;
    if (obj.options[obj.selectedIndex].value == "4") {
        form.Pr_name.style.display = "none";
        datetime.style.display = ""; //就是空字符串""
    } else {
        form.Pr_name.style.display = ""; //就是空字符串""
        datetime.style.display= "none";
    }
}[2]
<div id="datetime" style="display:none;position:absolute;"><input name="Pr_name_1" type="text" size="12" onFocus="WdatePicker({isShowWeek:true})"/><input name="Pr_name_2" type="text" size="12" onFocus="WdatePicker({isShowWeek:true})"/>
            </div>
datetime这个div的style加上position:absolute;
<div id="datetime" style="display:none;position:absolute;">可以解决选择进厂时间换行的问题
但是选择其他的还是会换行，有办法解决吗？
谢谢！
function changeQuery() {
    var obj = event.srcElement;
    var form = obj.form;
    if (obj.options[obj.selectedIndex].value == "4") {
        form.Pr_name.style.display = "none";
        datetime.style.display = ""; //就是空字符串""
    } else {
        form.Pr_name.style.display = ""; //就是空字符串""
        datetime.style.display= "none";
    }
}
将div换成span，脚本改成这样
if (obj.options[obj.selectedIndex].value == "4") {
        form.Pr_name.style.display = "none";
        datetime.style.display = "";
    } else {
        form.Pr_name.style.display = "";
        datetime.style.display= "none";
    }
<html><head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<title>新建网页 1</title>
</head><body>
    <div>
        <form name="searchsoft" method="get" action="workerlist.asp">
            <input name="P_pass" type="radio" value="False" onClick="submit();" <%if P_pass="False" then response.write " checked"%>>
            在职员工    
            <input name="P_pass" type="radio" value="True" onClick="submit();" <%if P_pass="True" then response.write " checked"%>>
            离职员工<br>
            <select name="xuanze" onChange="changeQuery();" style="float:left">
              <option value="1">姓名</option>
              <option value="2">籍贯</option>
              <option value="3">职业</option>
              <option value="4">入厂时间</option>
            </select>
            <input name="Pr_name" type="text" size="12" style="float:left">
            <div id="datetime" style="display:none;float:left"><input name="Pr_name_1" type="text" size="12" onFocus="WdatePicker({isShowWeek:true})"/><input name="Pr_name_2" type="text" size="12" onFocus="WdatePicker({isShowWeek:true})"/>
            </div>
            <input name="Query" type="submit" value="查询">
        </form>
    </div>
<script language="javascript">

</script>
</body></html>