;(function(root, factory) {

    // Support AMD

    if (typeof define === 'function' && define.amd) {

        define([], factory);

        // Support CommonJS

    } else if (typeof exports === 'object') {

        var accFloating = factory();

        // Support NodeJS & Component, which allow module.exports to be a function

        if (typeof module === 'object' && module && module.exports) {

            exports = module.exports = accFloating;

        }

        // Support CommonJS 1.1.1 spec

        exports.accFloating = accFloating;

        // Support vanilla script loading

    } else {

        root.accFloating = factory();

    }

}(this, function() {

    /**

     * 获取小数点后数字长度

     * @author zhongjiewang

     * @param  {Number} num 数字

     * @return {Number}     长度

     */

    function decimalLength(num) {

        var str = num.toString();

        var index = str.indexOf('.');

        return index == -1 ? 0 : str.substr(index + 1).length;

    }

    /**

     * 小数点后补齐0作为整数

     * @author zhongjiewang

     * @param  {Number} num    数字

     * @param  {Number} length 补齐的长度

     * @return {Number}        整数

     */

    function suffixInteger(num, length) {

        var str = num.toString();

        var decimalLen = decimalLength(num);

        str += Math.pow(10, length - decimalLen).toString().substr(1);

        return Number(str.replace('.', ''));

    }

    // 加法

    function accAdd(num1, num2) {

        var r1 = decimalLength(num1);

        var r2 = decimalLength(num2);

        var max = Math.max(r1, r2);

        var n1 = suffixInteger(num1, max);

        var n2 = suffixInteger(num2, max);

        return Number(((n1 + n2) / Math.pow(10, max)).toFixed(max));

    }

    // 减法

    function accSubtr(num1, num2) {

        var r1 = decimalLength(num1);

        var r2 = decimalLength(num2);

        var max = Math.max(r1, r2);

        var n1 = suffixInteger(num1, max);

        var n2 = suffixInteger(num2, max);

        return Number(((n1 - n2) / Math.pow(10, max)).toFixed(max));

    }

    // 乘法

    function accMul(num1, num2) {

        var r1 = decimalLength(num1);

        var r2 = decimalLength(num2);

        var max = Math.max(r1, r2);

        var n1 = suffixInteger(num1, max);

        var n2 = suffixInteger(num2, max);

        return n1 * n2 / Math.pow(10, max * 2);

    }

    // 除法

    function accDiv(num1, num2) {

        var r1 = decimalLength(num1);

        var r2 = decimalLength(num2);

        var max = Math.max(r1, r2);

        var n1 = suffixInteger(num1, max);

        var n2 = suffixInteger(num2, max);

        return n1 / n2;

    }

    return {

        add: accAdd,

        subtr: accSubtr,

        mul: accMul,

        div: accDiv

    }

}));