Ajax asynchronous calls assign the return value to a global variable. The most important thing is to change the async attribute to false,

<SCRIPT>

$ (Document). Ready (function (){
<%
String dqsj = system. datetime. Now. tostring ("yyyy-mm-dd ");
%>
Seach ();

});
VaR shuju = "";
VaR SJ = "";
Function Se ()
{
Seach ();
}
Function seach (){
$ (Function (){
VaR strtady = $ ("# txtcxsj"). Val ();
$. Ajax ({
Async: false,
Type: "Post ",
URL: "/qbjl/dqwdxx? Strtady = "+ strtady,
Datatype: 'json ',
Success: function (data ){
Shuju = data. Rows;
SJ = data. rows1;
}
});
$ ('# Iner'). highcharts ({
Chart :{
Zoomtype: 'xy ',
Plotbackgroundimage: '/yxjc/XML/themebg.png ',
Backgroundcolor: '# e9ecef'
},
Credits :{
Enabled: false // disable copyright information
},
Title :{
Text: 'atmospheric temperature data display'
},
Xaxis :[{
Categories: eval (SJ)
}],
Yaxis :[
{// Secondary yaxis
Gridlinewidth: 0,
Title :{
Text: 'atmospheric temperature ',
Style :{
Color: highcharts. getoptions (). colors [0]
}
},
Labels :{
Format: '{value} ℃ ',
Style :{
Color: highcharts. getoptions (). colors [0]
}
}

}
],
Tooltip :{
Shared: True
},
Legend :{
Layout: 'signature ',
Align: 'center ',
X: 350,
Verticalalign: 'top ',
Y: 15,
Floating: True,
Backgroundcolor: (highcharts. Theme & highcharts. theme. legendbackgroundcolor) | '# ffff'
},

Series :[{

Name: 'atmospheric temperature ',
Data: eval (shuju)

}]

});
});
}
Function istady (){
Strtady = $ ("# txtcxsj"). Val ();
VaR strsj = new date ();
VaR strrq = strsj. Format ("yyyy-mm-dd ");
If (strtady! = ""){
If (strtady <strrq ){
$ ("# Nextbtn"). Show ();
}
Else {
$ ("# Nextbtn"). Hide ();
}
}
}
Function backday (){
Strtady = $ ("# txtcxsj"). Val ();
If (strtady! = ""){
VaR day = new date (date. parse (strtady. Replace (/-/g ,'/')));
Day. setdate (day. getdate ()-1 );

$ ("# Txtcxsj"). Val (day. Format ("yyyy-mm-dd "));
Seach ();
}
Else {
Alert ("query date cannot be blank ");
}

}
Function nextday (){
Strtady = $ ("# txtcxsj"). Val ();
If (strtady! = ""){
VaR day = new date (date. parse (strtady. Replace (/-/g ,'/')));
Day. setdate (day. getdate () + 1 );
$ ("# Txtcxsj"). Val (day. Format ("yyyy-mm-dd "));
Seach ();
}
Else {
Alert ("query date cannot be blank ");
}
}

Date. Prototype. format = function (Format ){
VaR o = {
"M +": This. getmonth () + 1,
"D +": This. getdate (),
"H +": This. gethours (),
"M +": This. getminutes (),
"S +": This. getseconds (),
"Q +": Math. Floor (this. getmonth () + 3)/3 ),
"S": This. getmilliseconds ()
}
If (/(Y +)/. Test (Format )){
Format = format. Replace (Regexp. $1, (this. getfullyear () + ""). substr (4-Regexp. $1. Length ));
}
For (var k in O ){
If (New Regexp ("(" + K + ")"). Test (Format )){
Format = format. Replace (Regexp. $1, Regexp. $1. Length = 1? O [k]: ("00" + O [k]). substr ("" + O [k]). Length ));
}
}
Return format;
}
</SCRIPT>
<Div class = "box2" paneltitle = "" id = "searchpanel">
<Form action = "" id = "queryform" method = "Post">
<Input type = "hidden" id = "parentid" name = "parentid" value = "1"/>
<Table cellpadding = "0" cellspacing = "0" width = "100%" class = "table">
<Tr>
<TD class = "ti_blue" width = "70" style = "text-align: Right"> query Date:
</TD>
& Lt; TD width = "150" & gt;

<Input type = "text" class = "date" id = "txtcxsj" datefmt = "yyyy-mm-dd" name = "gcjcxx. jcny "onpropertychange =" istady () "value =" <% = dqsj %> "/>

</TD>
<TD class = "ti_blue" width = "220" style = "text-align: Left">

<Button type = "button" onclick = "backday ()"> <SPAN class = "icon_find"> last day </span> </button> & nbsp;
<Button type = "button" onclick = "nextday ()" id = "nextbtn" style = "display: none "> <SPAN class =" icon_find "> next day </span> </button>
</TD>
<TD align = "right" style = "padding-Right: 10px">

<Button type = "button" onclick = "Se ()"> <SPAN class = "icon_find"> query </span> </button>
</TD>
</Tr>
</Table>
</Form>
</Div>
<Div style = "border: solid 1px # bcf5f5">
<Div id = "Container" style = "Min-width: 700px; Height: 400px;"> </div>
</Div>
<Div style = "height: 0px; width: 100%;"> </div>