面试编程小题后续继续更新添加-优快云博客

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<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>code</title>
</head>

<body>

</body>
<script>

    var a = 1;
    function b() {
        var a = 2;
        function c() {
            console.log(this.a);
            console.log(a)
        }
        return c;
    }
    b()(); // 1 2

    var obj = {
        a: 3,
        b: function () {
            console.log(a)
            console.log(this.a)
        }
    };
    var a = 4;
    var objb = obj.b;
    obj.b() // 4 3
    objb() // 44
    obj.b.call(window) // 44

    // 递归求1,2,3,...n...,3,2,1和
    function foo(n) {
        if (n < 2) {
            return 1;
        } else if (n >= 2) {
            return n + foo(n - 1) + (n - 1);
        }
    }
    console.log(foo(4))

    // aaa=111&bbb=222&ccc=333 转为对象
    var str = "aaa=111&bbb=222&ccc=333", obj = {};
    var arr = str.split("&")
    for (var i = 0; i < arr.length; i++) {
        var arr2 = arr[i].split("=")
        obj[arr2[0]] = arr2[1];
    }
    console.log(obj)

    // 自执行函数会产生闭包
    var obj = {
        name: " jsCoder",
        skill: ["css3", "html5", "es6", "react", "angular"],
        say: function () {
            for (var i = 0, len = this.skill.length; i < len; i++) {
                (function () {
                    var temp = i;
                    setTimeout(function () {
                        console.log("No." + temp + obj.name);
                        console.log(obj.skill[temp]);
                        console.log('--------------------------');
                    }, 100);
                })();
            }
        }
    };
    obj.say();

    // 数组降低维度，然后去重，排序
    var arr = [[1, 2, 2], [3, 4, 5, 5], [6, 7, 8, 9, [11, 12, [12, 13, [14]]]], 10];
    var newArray = [];
    function getArray(array) {
        array.forEach((item, index) => {
            if (typeof item === 'object') {
                getArray(item)
            } else {
                newArray.push(item)
            }
        })
    }
    getArray(arr);
    console.log(newArray);

    // 去重
    Array.prototype.distinct = function () {
        var arr = this,
            obj = {},
            result = [];
        arr.forEach((item, index) => {
            if (!obj[arr[item]]) {
                obj[arr[item]] = 1
                result.push(arr[item])
            }
        })
        return result;
    };
    result = newArray.distinct().sort(function (a, b) {
        return a - b;
    });
    console.log(result)

    // 深拷贝
    function deepclone(p, s) {
        var s = s || {};
        for (var prop in p) {
            if (typeof p[prop] == "object") {
                s[prop] = (p[prop].constructor === "Array") ? [] : {};
                deepclone(p[prop], s[prop]);
            } else {
                s[prop] = p[prop];
            }
        }
        return s;
    }

    // promise 用法，以次输出 0 1 2 3 4 5
    const tasks = []; // 这里存放异步操作的 Promise
    const output = (i) => new Promise((resolve) => {
        setTimeout(() => {
            console.log(new Date, i);
            resolve();
        }, 1000 * i);
    });

    // 生成全部的异步操作
    for (var i = 0; i < 5; i++) {
        tasks.push(output(i));
    }
    // 异步操作完成之后，输出最后的 i
    Promise.all(tasks).then(() => {
        setTimeout(() => {
            console.log(new Date, i);
        }, 1000);
    });


</script>

</html>