image参数里面如果有斜杠(/),水印就打不成了。
像这样:
https://dev-bj-1256638418.image.myqcloud.com/2018/07/04/shop_qrcode1530705293549986.jpg?watermark/1/image/aHR0cDovL2Rldi1iai0xMjU2NjM4NDE4LnBpY2d6Lm15cWNsb3VkLmNvbS8yMDE4LzA3LzEwL3Nob3BfbG9nbzE1MzEyMjUzMzY5NTcyMC5qcGc/aW1hZ2VWaWV3Mi8xL3cvMTAwL2gvMTAw/gravity/center
aHR0cDovL2Rldi1iai0xMjU2NjM4NDE4LnBpY2d6Lm15cWNsb3VkLmNvbS8yMDE4LzA3LzEwL3Nob3BfbG9nbzE1MzEyMjUzMzY5NTcyMC5qcGc/aW1hZ2VWaWV3Mi8xL3cvMTAwL2gvMTAw
base64_decode出来是一张正常的图:
http://dev-bj-1256638418.picgz.myqcloud.com/2018/07/10/shop_logo153122533695720.jpg?imageView2/1/w/100/h/100
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