SOURCE

function bigNumberTransform(value) {
    if (isNaN(Number(value))) {
        return value
    }
    const newValue = ['', '', '']
    let fr = 1000
    let num = 3
    let text1 = ''
    let fm = 1
    while (value / fr >= 1) {
        fr *= 10
        num += 1
        // console.log('数字', value / fr, 'num:', num)
    }
    if (num <= 4) { // 千
        newValue[0] = parseInt(value / 1000) + ''
        newValue[1] = '千'
    } else if (num <= 8) { // 万
        text1 = parseInt(num - 4) / 3 > 1 ? '千万' : '万'
        // tslint:disable-next-line:no-shadowed-variable
        fm = text1 === '万' ? 10000 : 10000000
        if (value % fm === 0) {
            newValue[0] = parseInt(value / fm) + ''
        } else {
            newValue[0] = parseFloat(value / fm).toFixed(1) + ''
        }
        newValue[1] = text1
    } else if (num <= 16) { // 亿
        text1 = (num - 8) / 3 > 1 ? '千亿' : '亿'
        text1 = (num - 8) / 4 > 1 ? '万亿' : text1
        text1 = (num - 8) / 7 > 1 ? '千万亿' : text1
        // tslint:disable-next-line:no-shadowed-variable
        fm = 1
        if (text1 === '亿') {
            fm = 100000000
        } else if (text1 === '千亿') {
            fm = 100000000000
        } else if (text1 === '万亿') {
            fm = 1000000000000
        } else if (text1 === '千万亿') {
            fm = 1000000000000000
        }
        if (value % fm === 0) {
            newValue[0] = parseInt(value / fm) + ''
        } else {
            newValue[0] = parseFloat(value / fm).toFixed(2) + ''
        }
        newValue[1] = text1
    }
    if (value < 1000) {
        newValue[0] = value + ''
        newValue[1] = ''
    }
    return newValue.join('')
}

console.log(bigNumberTransform('123212234'))