js 根据传入数字，返回千、万、百万、千万、亿等单位

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<script>
        function simplifyNum(number) {
            if (!number && number != 0) return number;
            var str_num
            if (number >= 1E3 && number < 1E4) {
                str_num = number / 1E3
                return str_num + '千'
            } else if (number >= 1E4 && number < 1E6) {
                str_num = number / 1E4
                return str_num + '万'
            } else if (number >= 1E6 && number < 1E7) {
                str_num = number / 1E6
                return str_num + '百万'
            } else if (number >= 1E7 && number < 1E8) {
                str_num = number / 1E7
                return str_num + '千万'
            } else if (number >= 1E8 && number < 1E10) {
                str_num = number / 1E8
                return str_num + '亿'
            } else if (number >= 1E10 && number < 1E11) {
                str_num = number / 1E10
                return str_num + '百亿'
            } else if (number >= 1E11 && number < 1E12) {
                str_num = number / 1E11
                return str_num + '千亿'
            } else if (number >= 1E12) {
                str_num = number / 1E12
                return str_num + '万亿'
            } else { //一千以下
                return number
            }
        }
        console.log(simplifyNum(100000))
    </script>