<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>Promise API</title> </head> <body> <script> // let p = new Promise((resolve, reject) => { // ** 同步调用 // console.log(111); //修改 promise 对象的状态 reject('error'); }); // console.log(222); //执行 catch 方法 p.catch(reason => { console.log(reason); }); </script> </body> </html>