function range() {
    var argLength = arguments.length,
    array = [],
    i = 0,
    start = arguments[0],
    stop = arguments[1],
    step = arguments[2];
    switch(argLength) {

        case 0: 
            throw Error('至少输入一个参数,限止数组在哪里结束');

        case 1: 
            stop = arguments[0];
            for(i = 0; i < stop; i++) {
                array.push(i);
            }
            return array;
        case 2:
            for(i = start; i < stop; i++) {
                array.push(i);
            }
            return array;
        case 3:
            if(step < 1) {
                throw Error('step > 1');
            }
            for(i = start; i < stop; i+=step) {
                array.push(i);
            }
            return array;
        default : 
            throw Error('最多传入三个参数');
    }
}