请改用jquery data:

Use jquery data instead:

$("#submitForm").data('transaction', transactionID);

还有

var number_id = $("#submitForm").data('transaction');

请注意，这不会将属性添加到DOM，如果您通过开发人员工具检查元素，则不会看到data-transaction，但是元素将引用数据.

Notice that this will not add the attribute to the DOM, if you inspect the element via the developers tool, you won't see data-transaction, but the element will have the data referenced.

您的方法也应该起作用，但是正如@Tushar指出的那样，您缺少选择器中的#:$("submitForm")-> $("#submitForm")

Your method should also work, but as @Tushar pointed out, you are missing the # from your selector: $("submitForm") -> $("#submitForm")