解决vant 框架 tab切换插件标题样式不能自定义问题找到源码：node_modules/vant/es/tabs/Title.js修改如下代码：
return h("div", {

"attrs": {

"role": "tab",

"aria-selected": this.isActive

},

"class": [bem({

active: this.isActive,

disabled: this.disabled,

complete: !this.ellipsis

}), {

'van-ellipsis': this.ellipsis

}],

"style": this.style,

"on": {

"click": this.onClick

}

}, [h("span", {

"class": bem('text')

}, [this.slots() || this.title, h(Info, {

"attrs": {

"dot": this.dot,

"info": this.info

}

})])]);

return h("div", {

"attrs": {

"role": "tab",

"aria-selected": this.isActive

},

"class": [bem({

active: this.isActive,

disabled: this.disabled,

complete: !this.ellipsis

}), {

'van-ellipsis': this.ellipsis

}],

"style": this.style,

"on": {

"click": this.onClick

}

}, [h("span", {

"class": bem('text')

}, [this.slots() || this.title, h(Info, {

"attrs": {

"dot": this.dot,

"info": this.info

}

})])]);

this.title即是标题；新增一个span标签
看情况修改
看情况修改
[h("span", {

"class": bem('text')

}, [this.slots() || this.title, h(Info, {

"attrs": {

"dot": this.dot,

"info": this.info

}

}),h("span","看情况修改")])]
[h("span", {

"class": bem('text')

}, [this.slots() || this.title, h(Info, {

"attrs": {

"dot": this.dot,

"info": this.info

}

}),h("span","看情况修改")])]
最后在app.vue中修改样式
.van-tabs__nav--line .van-tab .van-tab__text span{

color:#cc0000 !important;
}
.van-tabs__nav--line .van-tab .van-tab__text span{

color:#cc0000 !important;
}补充知识：vant样式改不动？进入调试器找生成的class类名设置样式补充知识：补充知识：vant样式改不动？进入调试器找生成的class类名设置样式vant样式改不动？进入调试器找生成的class类名设置样式用vue写的项目需要注意的地方是，在scoped里修改是无法做到修改vant样式的，这是外部引入的。我们需要新建一个，然后在里面用自己的类名限定住这个样式的修改。举例：以上这篇vant 解决tab切换插件标题样式自定义的问题就是小编分享给大家的全部内容了，希望能给大家一个参考。