var ul = document.querySelector("ul");
ul.addEventListener("mousedown", mouseHandler);
function mouseHandler(e) {
e.preventDefault();
if (e.target.nodeName !== "LI") return;
var arr = Array.from(ul.children);
var index = arr.indexOf(e.target);
console.log(index);
}
Implemented in native js, when clicking on a list, the corresponding output index
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Origin www.cnblogs.com/wuqilang/p/11204671.html
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