js代码：
$(function() {
$('#submit').click(function() {
var d = {};
var t = $('form').serializeArray();
$.each(t, function() {
d[this.name] = this.value;
});
alert(JSON.stringify(d));
});
});
html：
<form>
<input id="a1" type="input" value="" name="a1"><br>
<input id="a2" type="input" value="" name="a2"><br>
<input id="a3" type="input" value="" name="a3"><br>
<input id="a4" type="input" value="" name="a4"><br>
<select id="ax" name="ax">
<option value="0">选项1</option>
<option value="1">选项2</option>
</select><br>
<input id="submit" type="button" value="提交" name="submit">
</form>