js 数组分组

  //根据组合操作
    this.group = function () {
        var arg = getArg(arguments);
        var o = arg["A"][0] || [];
        var field = arg["s"][0] || arg["A"][1] || null;
        var judge = arg["f"][0] || function () {};
        if (o.constructor == Array) {
            var tmp = {};
            var ret = [];
            if (field) {
                var fields = (field.constructor == Array) ? field : field.split(',');
                var getItem = function (item) {
                    var ret = {};
                    for (var j = 0, jLen = fields.length; j < jLen; j++) {
                        var key = fields[j];
                        ret[key] = item[key];
                    }
                    return ret;
                }
                var getKey = function (item) {
                    var ret = "";
                    for (var j = 0, jLen = fields.length; j < jLen; j++) {
                        var key = fields[j];
                        var itemKey = item[key] == null ? "" : item[key];
                        ret += "_" + itemKey;
                    }
                    return ret;
                }
                for (var i = 0, len = o.length; i < len; i++) {
                    var item = o[i];
                    var key = getKey(item);
                    if (tmp[key]) {
                        tmp[key].data.push(item);
                    } else {
                        tmp[key] = {
                            item: getItem(item),
                            data: [item]
                        };
                    }
                }
                for (var key in tmp) {
                    judge(tmp[key].item, tmp[key].data);
                    ret.push(tmp[key].item);
                }
                return ret;
            }
        }
    }
   var getArg = function (arg) {
        var ret = {
            'n': [], //number
            's': [], //string
            'b': [], //boolean
            'o': [], //object
            'O': [], //Object
            'A': [], //Array
            'f': [], //function
            'D': [], //Date
            'nl': [], //null
            'v': [] //value就是值
        }
        for (var i = 0, len = arg.length; i < len; i++) {
            var ar = arg[i];
            if (typeof (ar) == 'number') {
                ret['n'].push(ar);
                ret['v'].push(ar);
            } else if (typeof (ar) == 'string') {
                ret['s'].push(ar);
                ret['v'].push(ar);
            } else if (typeof (ar) == 'boolean') {
                ret['b'].push(ar);
                ret['v'].push(ar);
            } else if (typeof (ar) == 'function') {
                ret['f'].push(ar);
            } else if (typeof (ar) == 'object') {
                if (ar) {
                    if (ar.constructor == Object) {
                        ret['o'].push(ar);
                        ret['O'].push(ar);
                    } else if (ar.constructor == Array) {
                        ret['o'].push(ar);
                        ret['A'].push(ar);
                    } else if (ar.constructor == Date) {
                        ret['D'].push(ar);
                    }
                } else {
                    ret['nl'].push(ar);
                    ret['v'].push(ar);
                }
            }
        }
        return ret;
    }
   
   

想用更多的方法请打开JavaScript基础包

转载于:https://my.oschina.net/u/3875237/blog/3053358