格式化金額，傳回兩位小數，大金額以千分位分割

/* 
    *格式化金額，傳回兩位小數，大金額傳回 12,000,000.00
    */
    formatPrice: function (val) {
        let v = Number(val).toFixed(2)
        let vsplit = v.split('.')
        let join = ''

        if (vsplit[0].length > 3) {
            let temp = vsplit[0].split('').reverse()
            let len = temp.length
            let wrap = ''
            for (let i = 0; i < len; i++) {
                if (i < 1) {
                    join += temp[i]
                } else {
                    join += ((i + 1) % 3 === 0 ? (temp[i] + ',') : temp[i])
                }
            }
            wrap = join.split('').reverse().join('')
            if (wrap.charAt(0) == ',') {
                wrap = wrap.substr(1, wrap.length - 1)
            }
            return wrap + '.' + vsplit[1]
        }
        return v
    },