这段javascript看不到，请帮忙解释下!

Question

if (window.confirm("是否确认删除选中的数据？")) {
//执行删除
with (document.getElementById("userForm")) {
method = "post";
action = "user_maint.jsp?command=delete"
submit();
}
}with不明白什么？

Answer 1

可以理解为，with后面{}的内容都是作用于with的那个对象with (document.getElementById("userForm")) {
method = "post";
action = "user_maint.jsp?command=delete"
submit();
} 相当于
var formObj = document.getElementById("userForm");
formObj.method="post";
....

Answer 2

with (document.getElementById("userForm")) { 
method = "post"; 
action = "user_maint.jsp?command=delete" 
submit(); 
} 相当于
var userForm = document.getElementById("userForm");
userForm.method = "post";
userForm.action = "user_maint.jsp?command=delete"
userForm.submit();