function numberFormat(number, decimals = 2, dec_point, thousands_sep) {
	/*
	 * 参数说明：
	 * number：要格式化的数字
	 * decimals：保留几位小数
	 * dec_point：小数点符号
	 * thousands_sep：千分位符号
	 * */
	number = (number + '').replace(/[^0-9+-Ee.]/g, '')
	let n = !isFinite(+number) ? 0 : +number
	let prec = !isFinite(+decimals) ? 0 : Math.abs(decimals)
	let sep = (typeof thousands_sep === 'undefined') ? ',' : thousands_sep
	let dec = (typeof dec_point === 'undefined') ? '.' : dec_point
	let s = ''
	const toFixedFix = function(n, prec) {
		let k = Math.pow(10, prec)
		return '' + Math.floor(n * k) / k
	};
	s = (prec ? toFixedFix(n, prec) : '' + Math.floor(n)).split('.')
	let re = /(-?\d+)(\d{3})/
	while (re.test(s[0])) {
		s[0] = s[0].replace(re, "$1" + sep + "$2")
	}

	if ((s[1] || '').length < prec) {
		s[1] = s[1] || ''
		s[1] += new Array(prec - s[1].length + 1).join('0')
	}
	return s.join(dec)
}

export default {
	numberFormat
}