js表单实现在iframe里post传参

html部分

<form id="form1" action="${url}" target="target1" method="post">
    <input type="hidden" name="appId" value="${appId}"/>
    <input type="hidden" name="userId" value="${userId}"/>
    <input type="hidden" name="interfacesURL" value="${interfacesURL}"/>  
    <input type="hidden" name="userName" value="${userName}"/>
    <input type="hidden" name="userType" value="${userType}"/>
</form>
<iframe id="_iframe" name="target1" src="" style="width:100%;height:1267px;border:none;"></iframe><form id="form1" action="${url}" t