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<script>
function show(){
var obj=document.getElementById("sel1");
for(var i=obj.options.length-1;i>=0;i--)
obj.options[i]=null;
for(var i=0;i<5;i++)
obj.options[i]=new Option("name"+i,"value"+i);
}
</script>
<input type="button" value="show" onclick="show()">
<SELECT id="sel1" SIZE="5">
<OPTION VALUE="id1" SELECTED>name1</OPTION>
<OPTION VALUE="id2">name2</OPTION>
</SELECT>
var url = "/MainData/GetCity";
var str = "<option value='0000'>请选择所在市</option>";
$.getJSON(url, function(data) {
$.each(data, function(i, item) {
str += '<option value=' + item["id"] + '>' + item["name"] + '</option>';
});
$("#city").html(str);
});
<script>
function show(){
var obj=document.getElementById("sel1");
for(var i=obj.options.length-1;i>=0;i--)
obj.options[i]=null;
}
</script>
<input type="button" value="show" onclick="show()">
<SELECT id="sel1" SIZE="5">
<OPTION VALUE="id1" SELECTED>name1</OPTION>
<OPTION VALUE="id2">name2</OPTION>
</SELECT>