Answer 1

function findChar(char) {
    let obj = {};
    let reg = /(w)1/g;

    char.match(reg).map(str = >Object.keys(obj).indexOf(str) > -1 ? obj[str] = obj[str] + str.length: obj[str] = str.length);

    return obj
}

findChar('abbkejsbbcccwqaa');

Answer 2

我是这样理解的：

left + right > container 则此时需要收缩，反正则需要扩张

收缩计算过程：

• 1.计算收缩值：500 + 400 - 600 = 300
• 2.计算总的收缩权重值：500 * 2 + 400 × 1 = 1400
• 3.计算项目收缩空间：(项目宽度 - 项目宽度 × 总溢出空间 × flex-shrink / 总权重)
  left = 500 - 500 × 300 × 2 / 1400 ≈ 285.71
  right = 400 - 400 × 300 × 1 / 1400 ≈ 314.28

扩张计算过程：

• 1.计算扩张总内容 container - (left + right)
• 2.计算每份扩张值：总内容/(left(flex-grow) + right(flex-grow))
• 3.计算项目夸张大小：(项目宽度 + 每份扩张值 × 扩张系数(flex-grow))

应该是这样
//如果left + right = container，flex-grow和flex-shrink 失效;

Answer 3

Array.prototype.spliceMy = function (startIndex, endIndex, ...item) {
    if (startIndex < 0) {
        startIndex = this.length + startIndex
        endIndex = this.length + startIndex + endIndex
    } else {
        endIndex = startIndex + endIndex
    }
    let arrStart = this.slice(0, startIndex)
    let arrEnd = this.slice(endIndex, this.length)
    console.log(arrStart, arrEnd)
    let returnArr = this.slice(startIndex, endIndex)
    let newArr = arrStart.concat(item).concat(arrEnd)
    for (let i = 0; i < newArr.length; i++) {
        this[i] = newArr[i];
    }
    this.length = newArr.length
    return returnArr
}

Answer 4

@VimMing 已修复，多谢指正。

Answer 5

源自提高幸福感的 9 个 CSS 技巧