Protractor dragAndDrop not working

问题

I have tried all possible ways for drag and dropping the elements available in the below link,

https://the-internet.herokuapp.com/drag_and_drop

But i am unable to achieve drag and drop the elements between two boxes.

Methods i tried so for

1.browser.actions().mouseMove(a).mouseDown().mouseMove(b).mouseUp().perform()
2.browser.actions().dragAndDrop(a,b).perform()
3.browser.driver.actions().dragAndDrop(a,{x:1000,y:0}).perform();

All the above methods are not working. Can some one figure out the possible work around for achieve dragAndDrop function on the elements.

Thanks in advance!!

来源：https://stackoverflow.com/questions/39575715/protractor-draganddrop-not-working