jquery函数冲突

[pan740736297]

<script type="text/javascript">
alert('TTTTTT');
$(document).ready(function () {
alert('11111jiazai');
$(':input').on('keydown', function (e) {
var keyCode = e.keyCode ? e.keyCode : e.which ? e.which : e.charCode;
alert('666666');
if (keyCode == 13) {
alert('555555');
var i;
for (i = 0; i < this.form.elements.length; i++)
if (this == this.form.elements[i])
break;
i = (i + 1) % this.form.elements.length;
this.form.elements[i].focus();
return false;

}
else
return true;


});

});


</script>
<script type="text/javascript">
function findValue(li) {
if (li == null) return alert("No match!");
if (!!li.extra)
var sValue = li.extra[0];
}
function selectItem(li) {
findValue(li);
}
function lookupLocal() {
var oSuggest = $(".ajaxinput")[0].autocompleter;
oSuggest.findValue();
return false;
}
$(document).ready(function () {
alert('222222jiazai');
$("#TxtExpress").autocomplete("ExpressCompany.aspx", {
delay: 300, //生成下拉框的时间
minChars: 1,
matchSubset: 1,
cacheLength: 10,
onItemSelect: selectItem,
onFindValue: findValue,
autoFill: true,
maxItemsToShow: 20
});


});

</script>

为什么这两个会冲突？怎么解决？