我怎样才能得到数组 indexOf 元素包括值

Question

How can i get array indexOf element includes value Like

var a = ["one","two","xx?ee"]; 

a.indexOf("?"); //i want to get indexOf element xx?ee

Answer 1

Use Array.findIndex and String.includes

 var a = ["one","two","xx?ee"]; var ndx = a.findIndex(e => e.includes("?")); console.log(ndx);

Keep in mind that this will return the first match only.

Answer 2

You can use reduce . This code will return an array , assuming that there can be multiple words wich contains ? . So this aray will contain the index of all those words.

 var a = ["one", "two", "xx?ee", "11?ee"]; function getIndex(key) { return a.reduce((acc, curr, index) => { if (curr.includes(key)) { acc.push(index) } return acc; }, []) } console.log(getIndex('?'))