dd_xcx/node_modules/@antv/util/lib/extend.js

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
var mix_1 = require("./mix");
var is_function_1 = require("./is-function");
var extend = function (subclass, superclass, overrides, staticOverrides) {
    // 如果只提供父类构造函数，则自动生成子类构造函数
    if (!is_function_1.default(superclass)) {
        overrides = superclass;
        superclass = subclass;
        subclass = function () { };
    }
    var create = Object.create ?
        function (proto, c) {
            return Object.create(proto, {
                constructor: {
                    value: c
                }
            });
        } :
        function (proto, c) {
            function Tmp() { }
            Tmp.prototype = proto;
            var o = new Tmp();
            o.constructor = c;
            return o;
        };
    var superObj = create(superclass.prototype, subclass); // new superclass(),//实例化父类作为子类的prototype
    subclass.prototype = mix_1.default(superObj, subclass.prototype); // 指定子类的prototype
    subclass.superclass = create(superclass.prototype, superclass);
    mix_1.default(superObj, overrides);
    mix_1.default(subclass, staticOverrides);
    return subclass;
};
exports.default = extend;
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