NzModal : click 'Mask' quickly , the callback 'onCancel 'is triggered twice, should only once

[dknfeiov]

Version

0.5.5

Environment

windows7 chrome: 61.0.3163.79

Reproduction link

https://stackblitz.com/edit/ng-zorro-antd-setup-giu6if?embed=1&file=app/app.component.ts

Steps to reproduce

1. click the button , the modal is opened
2. quickly click the Mask , see the console , the onCancel is triggered twice, maybe more

What is expected?

the callback 'OnCancel' only be trigger once;

What is actually happening?

the callback 'OnCancel' be triggered twice ;

Other?

[vthinkxie]

the modal will be rewrite totally in version 0.7.0 ref #920

[lock]

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