如何通过JS来增加a标签的class样式

$(function(){

$(document).on("click",".nav-item>a",function(){

$(this).addClass("active").parent(".nav-item").siblings(".nav-item").children("a").removeClass("active")

})

})

如果好使，请给个采纳

<script>

var a = document.querySelectorAll("a")

var className = ["food", "travel", "sport", "fashion"]

for (var i = 0i <a.lengthi++) {

a[i].className = className[i]

}

</script>

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