Function filter

libs/echarts/echarts.simple.js:608–624

* 数组过滤 * @memberOf module:zrender/core/util * @param {Array} obj * @param {Function} cb * @param {*} [context] * @return {Array}

(obj, cb, context)

 * @return {Array}
 */
function filter(obj, cb, context) {
    if (!(obj && cb)) {
        return;
    }
    if (obj.filter && obj.filter === nativeFilter) {
        return obj.filter(cb, context);
    }
    else {
        var result = [];
        for (var i = 0, len = obj.length; i < len; i++) {
            if (cb.call(context, obj[i], i, obj)) {
                result.push(obj[i]);
            }
        }
        return result;
    }
}

/**
 * 数组项查找