Js ดัชนีของสุดท้ายของ accurence
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จาวาสคริปต์ได้เมื่อรายการที่อยู่ในตารางคู่ลำดับ
var colors = ["red","blue","green"];
var green = colors[colors.length - 1]; //get last item in the array
js สุดท้ายของดัชนี
const str = "Users/Edit/12345";
let idx = str.lastIndexOf("/"); // returns 10
idx = str.lastIndexOf("x"); // returns -1
idx = str.lastIndexOf("Edit") // returns 6
idx = str.lastIndexOf("edit") // returns -1 -- case sensitive
// add "from" parameter
// the search happens backwards, starting at the provided from parameter
idx = str.lastIndexOf("s"); // returns 4
idx = str.lastIndexOf("s", 3); // returns 1
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