sm's interview question

mian2.js

function numberToCN(number){
	number = parseInt(number,0);

	if(isNaN(number)){
		return false;
	}
	if(number === 0){
		return '零';
	}

	var numberList = (''+number).split(''),
		numbeMap = [false,'一','二','三','四','五','六','七','八','九'],
		decMap = ['','十','百','千','万','十','百','千','亿','十','百','千','万','兆'];
	return numberList.reverse().map(function (val,index){
		var vi = parseInt(val,0);
		if(vi == 0){
			if(index===4 || index === 8 || index === 13){
				return decMap[index];
			}
			return '';
		} else {
			if(vi == 1 && decMap[index] == '十'){
				return '十'
			}
			return numbeMap[vi]+decMap[index];
		}
	}).reverse().reduce(function (a,b,index) {
		// console.log(arguments);
		var tmp = a+b;
		if(!b){
			if(numberList.length-index<=2){
				if(tmp.substr(tmp.length-1,1) !== '零'){
					tmp += '零';
				}
			}
		}

		if(index == numberList.length-1){
			if(tmp.substr(tmp.length-1,1) == '零'){
				return tmp.substr(0,tmp.length-1)
			}
		}
		return tmp;
	});
}

// test 
numberToCN(1234563124) // => 一十二亿三千四百五十六万三千一百二十四
numberToCN(5234) // => 五千二百三十四

numberToCN(12)
numberToCN(102)
numberToCN(10000)
numberToCN(130202)
numberToCN(10002)