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the first mask image如何使用黑色图像作为svg掩码?
为什么不使用第一张掩模图像?
<svg width='200' height='200' baseProfile='full' version='1.2'>
<defs>
<mask id='svg_mask' maskUnits='userSpaceOnUse' maskContentUnits='userSpaceOnUse' transform='scale(1)'>
<image width='200' height='200'
xlink:href='http://i.stack.imgur.com/SXnMG.png' />
</mask>
</defs>
<image mask='url(#svg_mask)' width='200' height='200' y='0' x='0'
xlink:href='http://static.timeface.cn/times/0f62b706f726d823393290ef1ee60944.jpg' />
</svg>