yUtil.js

/**
 * 浮点数加法运算
 * @param arg1
 * @param arg2
 * @returns {number}
 */
function floatAdd(arg1, arg2) {
    var r1, r2, m;
    try{
        r1 = arg1.toString().split(".")[1].length;
    } catch(e) {
        r1 = 0;
    }
    try {
        r2 = arg2.toString().split(".")[1].length;
    } catch(e) {
        r2 = 0;
    }
    m = Math.pow(10, Math.max(r1, r2));
    return (arg1 * m + arg2 * m) / m;
}

/**
 * 浮点数减法运算
 * @param arg1
 * @param arg2
 * @returns {number}
 */
function floatSub(arg1, arg2) {
    var r1, r2, m, n;
    try {
        r1 = arg1.toString().split(".")[1].length;
    } catch(e) {
        r1 = 0
    }
    try {
        r2 = arg2.toString().split(".")[1].length;
    } catch(e) {
        r2 = 0
    }
    m = Math.pow(10, Math.max(r1, r2));
    n = (r1 >= r2) ? r1 : r2;
    return ((arg1 * m - arg2 * m) / m).toFixed(n);
}

/**
 * 浮点数乘法运算
 * @param arg1
 * @param arg2
 * @returns {number}
 */
function floatMul(arg1, arg2) {
    var m = 0, s1 = arg1.toString(), s2 = arg2.toString();
    try {
        m += s1.split(".")[1].length;
    } catch(e) {}
    try {
        m += s2.split(".")[1].length;
    } catch(e) {}
    return Number(s1.replace(".", "")) * Number(s2.replace(".", "")) / Math.pow(10, m);
}

/**
 * 浮点数除法运算
 * @param arg1
 * @param arg2
 * @returns {number}
 */
function floatDiv(arg1, arg2) {
    var t1 = 0, t2 = 0, r1, r2;
    try {
        t1 = arg1.toString().split(".")[1].length;
    } catch(e) {}
    try {
        t2 = arg2.toString().split(".")[1].length;
    } catch(e) {}
    with(Math) {
        r1 = Number(arg1.toString().replace(".", ""));
        r2 = Number(arg2.toString().replace(".", ""));
        return (r1 / r2) * pow(10, t2 - t1);
    }
}

/**
 * 千分位-格式化: 常用于显示价格
 * @param num
 * @returns {string}
 */
function toThousands(num) {
    return parseFloat(num).toFixed(2).replace(/(\d{1,3})(?=(\d{3})+(?:\.))/g, "$1,");
}