如下代码所示,给open()函数添加监听事件,在上一个异步函数执行完后进行调用,这个监听事件怎么写
```javascript
$.ajax({
url: "http://127.0.0.1/mysqlhelper.php",
//dateType:"json",
type: "post",
data: {
pageinfo: pageinfo,
type: "inquire",
},
error: function(request) {
console.log("Connection error");
},
success: function(res) {
console.log(res);
$(elm).trigger("onSubmit");
}
});
return datares;
});
var elm;
elm.addEventListener("onSubmit",
//open();
function open() {
}
)
```