javascript 实现数字转中文数字[原创]

function numToChinese(num) {
        this.chnum = ['零', '一', '二', '三', '四', '五', '六', '七', '八', '九', '十'];
        this.chsection = {
            unit: {
                2: '十',
                3: '百',
                4: '千',
                5: '万',
                9: '亿',
                13: '兆',
                17: ''
            },
            next: function (num) {
                for (let i in this.unit) {
                    if (i > num) {
                        return i;
                    }
                }
                return null;
            },
            get: function (index) {
                let min = 2, q;
                for (let i in this.unit) {
                    if (i > index) {
                        q = index - min + 1;
                        break;
                    }
                    min = i;
                }
                return this.unit[q];
            }
        };
        const getUnit = (narr, i) => {
            const len = narr.length - i;
            const num = Number(narr[i]);
            if (len < 2) {
                return null;
            }
            let unit = this.chsection.unit[len];
            if (num === 0) {
                if (len < 5 || !unit) {
                    return null;
                }
                let isZero = true;
                const next = this.chsection.next(len);
                if (!next) {
                    isZero = false;
                } else {
                    for (let i = len; i < next; i++) {
                        const index = narr.length - i;
                        if (narr[index] && narr[index] !== '0') {
                            isZero = false;
                            break;
                        }
                    }
                }
                if (isZero) return null;
            }
            if (unit) {
                return unit;
            } else {
                return this.chsection.get(len);
            }
        }

        num = Number(num);
        if (num < 10) {
            return this.chnum[num];
        }
        let chstr = '';
        let zero = false;
        // let model = 0;
        const narr = String(num).split('');
        for (let index = 0; index < narr.length; index++) {
            const num = Number(narr[index]);
            const str = this.chnum[narr[index]];
            const unit = getUnit(narr, index);
            if (num === 0) {
                zero = true;
            }
            if (zero && num !== 0) {
                chstr += this.chnum[0];
                zero = false;
            }
            if (!zero && (unit !== '十' || num !== 1 || index !== 0))
                chstr += str;
            chstr += unit || '';
        }
        return chstr;
    }

使用方法：

numToChinese(6542127);