js失效(传递的第二个参数是空)
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
<link rel="stylesheet" type="text/css" href="bootstrap/css/bootstrap.min.css"/>
<script src="bootstrap/jquery-3.3.1.js" type="text/javascript"
charset="utf-8"></script>
<script type="text/javascript" src="bootstrap/bootstrap.min.js"></script>
<script type="text/javascript">
<a href="javascript:dianzan('${fddetail.food_id }','${user.userid }')" ><img alt="" src="images/dianzan.png" id="dzdz"></a>
function dianzan(a,b){
alert(b);
if ($("#zhuangtai").val()==1){
$('#dzdz').attr('src','images/dianzan.png');
}else{
if (flag1 == 0) {
$('#dzdz').attr('src','images/dianzan.png');
}
if (flag1 == 1) {
$('#dzdz').attr('src','images/dianzanok.png');
}
if (flag1 == 2) {
$('#dzdz').attr('src','images/dianzan.png');
flag1 = 0;
}
flag1++;
}
$.ajax({
url:"caozuo?z=dianz",
async:false,
type:"POST",
dataType : "text",
data:{
food_id:a,
user_id:b
},
success:function(data){
$("#dznum").text(data);
}
})
}
flag1++;
会显示错误:((
caught ReferenceError: dianzan is not defined
at :1:1
这个jsp页面上的js都无效,但是只要第二个参数不为空,这个js就能成功,这是为什么(另一个就jsp页面也有这样的写法,可以成功,这个页面就不行)