htm里面的a链接标签，怎么在里面添加判断条件_html/css_WEB

htm里面的a超链接标签，怎么在里面加入判断条件，当条件符合时，该链接按钮可以正常显示使用，当条件不符合时，该链接按钮无法显示或者显示为灰色状态，类似于在text里面的readonly属性一样
回复讨论(解决方案)

样式是这样的，怎么可以加入判断条件？类似于
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