Function defaults

_benchmarks/sample_echarts.js:289–298

(target, source, overlay)

        return target;
    }
    function defaults(target, source, overlay) {
        var keysArr = keys(source);
        for (var i = 0; i < keysArr.length; i++) {
            var key = keysArr[i];
            if ((overlay ? source[key] != null : target[key] == null)) {
                target[key] = source[key];
            }
        }
        return target;
    }
    var createCanvas = function () {
        return methods.createCanvas();
    };