then.html


<!DOCTYPE html>
<html>
    <head>
        <title></title>
        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
        <script src="newPromise.js"></script>

        <script>
            window.onload = function () {
                var oldConsole = window.console

                window.console = {
                    log: function (str) {
                        if (oldConsole) {
                            oldConsole.log(str)
                        }
                        var div = document.createElement("div")
                        div.innerHTML = window.JSON ? JSON.stringify(str) : str;
                        document.body.appendChild(div);
                    }
                }

                var p = new Promise(function (r) {
                    r("先resolve值然后再添加回调")
                })
                setTimeout(function () {
                    p.then(function (a) {
                        console.log(a)
                        return 1
                    })
                    p.then(function (a) {
                        console.log(a)
                        return 1
                    })
                    p.then(function (a) {
                        console.log(a)
                    })
                }, 1000)


                var p2 = new Promise(function (r) {
                    setTimeout(function () {
                        r("先添加回调后resolve数据")
                    }, 2000)
                })
                p2.then(function (a) {
                    console.log(a)
                    return 2
                })
                p2.then(function (a) {
                    console.log(a)
                    return 2
                })
                p2.then(function (a) {
                    console.log(a)
                })

            }

        </script>
    </head>
    <body>
        <div>TEST by 司徒正美</div>
    </body>
</html>