js基本函数

js基本函数

不定参数求和

SUM: function (...arg) {
        let len = arg.length;
        if (len > 0){
            var sum = 0;

            for(let i=0;i<len;i++){
                sum += arg[i]
            }
            return sum
        }
        return ""
    },

不定参数求平均值

AVG: function (...arg) {
        let len = arg.length;
        if (len > 0){
            var sum = 0;

            for(let i=0;i<len;i++){
                sum += arg[i]
            }
            return sum/len
        }
        return ""
    },

不定参数求最大值

MAX :function (...arg){
        let len = arg.length;
        if (len > 0){
            var max = "Math.max(";
            
            for(let i=0;i<len;i++){
                max += arg[i] + ","
            }
            return eval（max.substr(0,max.length-1) +")")
        }

        return "";
    },

不定参数求最小值

MIN: function (...arg){
        let len = arg.length;
        if (len > 0){
            var min = "Math.min(";

            for(let i=0;i<len;i++){
                min += arg[i] + ","
            }
            return eval（min.substr(0,min.length-1) +")")
        }

        return "";
    },

四舍五入精确到固定位小数

ROUND: function (...arg){
        let len = arg.length;
        if (len == 1){
            return Math.round(arg[0] + 'e' + 2) / Math.pow(10, 2);
        } else if (len == 2){
            return Math.round(arg[0] + 'e' + arg[1]) / Math.pow(10, arg[1]);
        } else {
            return ""
        }
    },

获取日期类型参数年份 2006-10-01 12:00:05

YEAR: function (...arg){
        let len = arg.length;
        if (len == 1){
            return new Date(arg[0].replace(/-/g, '/')).getFullYear();
        }
        return ""
    },

获取日期类型参数月份 2006-10-01 12:00:05

MONTH: function (...arg){
        let len = arg.length;
        if (len == 1){
            return new Date(arg[0].replace(/-/g, '/'))..getMonth();
        }
        return ""
    },

获取日期类型参数日期 2006-10-01 12:00:05

DAY: function (...arg){
        let len = arg.length;
        if (len == 1){
            return new Date(arg[0].replace(/-/g, '/'))..getDate();
        }
        return ""
    },

获取日期类型参数小时 2006-10-01 12:00:05

HOUR: function (...arg){
        let len = arg.length;
        if (len == 1){
            return new Date(arg[0].replace(/-/g, '/'))..getHours();
        }
        return ""
    },

获取日期类型参数分钟 2006-10-01 12:00:05

MINUTE: function (...arg){
        let len = arg.length;
        if (len == 1){
            return new Date(arg[0].replace(/-/g, '/'))..getMinutes();
        }
        return ""
    },

获取日期类型参数秒数 2006-10-01 12:00:05

SECOND: function (...arg){
        let len = arg.length;
        if (len == 1){
            return new Date(arg[0].replace(/-/g, '/'))..getSeconds();
        }
        return ""
    },

返回当前的日期 2006-10-01

CURDATE: function (...arg){
        var date = new Date()
        var month = date.getMonth() + 1
        var strDate = date.getDate();

        if(date.getMonth() + 1 < 10){
            month = "0" + (date.getMonth() + 1)
        }
        if(date.getDate() < 10){
            strDate = "0" + date.getDate()
        }
        return date.getFullYear() + '-' + month + '-' + strDate
    },

返回当前日期时间字符串 2006-10-01 12:00:05

NOW: function (...arg){
        var date = new Date();
        var month = date.getMonth() + 1;
        var strDate = date.getDate();
        var hour = date.getHours();
        var minute = date.getMinutes();
        var second = date.getSeconds();

        if(date.getMonth() + 1 < 10){
        month = "0" + (date.getMonth() + 1)
        }
        if(date.getDate() < 10){
        strDate = "0" + date.getDate()
        }
        if(date.getHours() < 10){
        hour = "0" + date.getHours()
        }
        if(date.getMinutes() < 10){
        minute = "0" + date.getMinutes()
        }
        if(date.getSeconds() < 10){
        second = "0" + date.getSeconds()
        }

        return date.getFullYear() + '-' + month + '-' + strDate+ ' ' + hour + ':' + minute + ':' + second
    },

将两个字符串连接为一个字符串

CONCAT: function (...arg){
        let len = arg.length;
        if (len == 2){
            return arg[0].concat(arg[1]);
        }
        return ""
    },

返回文本字符串中从指定位置开始的特定数目的字符

SUBSTR: function (...arg){
        if (arg.length == 3){
            return arg[0].substr(arg[1], arg[2]);
        } else if (arg.length == 2){
            return arg[0].substr(arg[1], arg[0].toString().length);
        }
        return "";
    },

字符串的长度

LEN: function (...arg){
        if (arg.length == 1){
            return arg[0].length;
        }
        return "";
    },

字符串转大写

UPPER: function (...arg){
        if (arg.length == 1){
            return arg[0].toUpperCase();
        }
        return "";
    },

字符串转小写

LOWER: function (...arg){
        if (arg.length == 1){
            return arg[0].toLowerCase();
        }
        return "";
    },

替换字符串

REPLACE: function (...arg){
        if (arg.length == 3){
            return eval（"\""+arg[0] + "\"" + ".replace(" + "/" +arg[1] +"/g"
                +", "+ "\""+ arg[2] + "\"" + ")");
        }
        return "";
    },

按字符截取字段为数组，并返回数组前n个元素

SPLIT: function (...arg){
        if (arg.length == 3){
            return arg[0].split(arg[1], arg[2]);
        } else if (arg.length == 2){
            return arg[0].split(arg[1], arg[0].length);
        }
        return "";
    },