var list = [1, 2, 3, 4, 5, 6, 7, 8] var index = list.map(item => item).indexOf(8) console.log(index) //7
var array = [{ name: "aa" }, { name: "bb" }, { name: "cc" }, { name: "dd" }, { name: "ee" }] var line= array.map(item => item.name).indexOf('dd') console.log(line) //3
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