📅  最后修改于: 2022-03-11 15:05:00.155000             🧑  作者: Mango
var str = "The MEAN stack is MongoDB, Express.js, AngularJS, and Node.js";
str.indexOf('MongoDB') !== -1 // true
str.indexOf('Java') !== -1 //false
str.indexOf('Node', 5) !== -1 //true