DOMException: Failed to execute 'open' on 'XMLHttpRequest': Invalid URL

1、报错：DOMException: Failed to execute 'open' on 'XMLHttpRequest': Invalid URL

2、原因：

　　　http:\\127.0.0.1:8099\api\User\getUserByUserNameAndPassword

3、解决办法：

　　\ 要换成 /

　　http://127.0.0.1:8099/api/User/getUserByUserNameAndPassword