http://wap.8288888.cn/2018424/ wants to achieve such an effect
solve
tabArr:['',''],
active:0,
click(index){
this.active = index
}, active the easiest way is to get the tag to click in js, and add the css attribute 'text-decoration: underline', underline color to the color attribute after triggering the click event.
refer to CSS text-decoration attribute
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o ...
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