可以用 require.ensure， 或者在webpack中直接使用AMD风格的require.

webpack2已经支持了AMD风格加载异步模块，详情参见：https://webpack.github.io/doc...

---- 补充个荔枝： ---

实测可以这样写：

源代码：

// 
(function (){
    console.log("page loaded....")

    require(['jquery', 'lodash'], function($, _){
        console.log("jquery: ", $)
        console.log('lodash: ', _)
    })

})()

构建后：

 (function(module, __webpack_exports__, __webpack_require__) {

        "use strict";
        Object.defineProperty(__webpack_exports__, "__esModule", {
            value: true
        });
        /* harmony import */
        var __WEBPACK_IMPORTED_MODULE_0_babel_runtime_helpers_typeof__ = __webpack_require__(67);
        /* harmony import */
        var __WEBPACK_IMPORTED_MODULE_0_babel_runtime_helpers_typeof___default = __webpack_require__.n(__WEBPACK_IMPORTED_MODULE_0_babel_runtime_helpers_typeof__);

        console.log("page loaded....");

        console.log("do something before load jquery...");

        __webpack_require__.e /* require */
        (17).then(function() {
            var __WEBPACK_AMD_REQUIRE_ARRAY__ = [__webpack_require__(479), __webpack_require__(331)];
            (function($, _) {
                console.log("jquery and loadash loaded: ");
                console.log("jquery: ", typeof $ === "undefined" ? "undefined" : __WEBPACK_IMPORTED_MODULE_0_babel_runtime_helpers_typeof___default()($));
                console.log('lodash: ', typeof _ === "undefined" ? "undefined" : __WEBPACK_IMPORTED_MODULE_0_babel_runtime_helpers_typeof___default()(_));
            }
            .apply(null, __WEBPACK_AMD_REQUIRE_ARRAY__));
        }).catch(__webpack_require__.oe);

        console.log("do something else, now jquery and lodash are not loaded.");
        console.log("jquery: ", typeof $ === "undefined" ? "undefined" : __WEBPACK_IMPORTED_MODULE_0_babel_runtime_helpers_typeof___default()($));
        console.log('lodash: ', typeof _ === "undefined" ? "undefined" : __WEBPACK_IMPORTED_MODULE_0_babel_runtime_helpers_typeof___default()(_));

        /***/
    })

console输出：