我如何在另一个JavaScript文件中添加一个JavaScript文件,类似于CSS中的 @import?


当前回答

我有要求无同步加载一系列的JavaScript文件,最终进行呼叫回复。

// Load a JavaScript file from other JavaScript file
function loadScript(urlPack, callback) {
    var url = urlPack.shift();
    var subCallback;

    if (urlPack.length == 0) subCallback = callback;
    else subCallback = function () {
        console.log("Log script: " + new Date().getTime());
        loadScript(urlPack, callback);
    }

    // Adding the script tag to the head as suggested before
    var head = document.getElementsByTagName('head')[0];
    var script = document.createElement('script');
    script.type = 'text/javascript';
    script.src = url;

    // Then bind the event to the callback function.
    // There are several events for cross browser compatibility.
    script.onreadystatechange = subCallback;
    script.onload = subCallback;

    // Fire the loading
    head.appendChild(script);
}

例子:

loadScript(
[
    "js/DataTable/jquery.dataTables.js",
    "js/DataTable/dataTables.bootstrap.js",
    "js/DataTable/dataTables.buttons.min.js",
    "js/DataTable/dataTables.colReorder.min.js",
    "js/DataTable/dataTables.fixedHeader.min.js",
    "js/DataTable/buttons.bootstrap.min.js",
    "js/DataTable/buttons.colVis.min.js",
    "js/DataTable/buttons.html5.min.js"
], function() { gpLoad(params); });

第二个脚本不会充电,直到第一个完全充电,因此...

结果:

此分類上一篇

其他回答

我只是写了这个JavaScript代码(使用DOM操作的Prototype):

var require = (function() {
    var _required = {};
    return (function(url, callback) {
        if (typeof url == 'object') {
            // We've (hopefully) got an array: time to chain!
            if (url.length > 1) {
                // Load the nth file as soon as everything up to the
                // n-1th one is done.
                require(url.slice(0, url.length - 1), function() {
                    require(url[url.length - 1], callback);
                });
            } else if (url.length == 1) {
                require(url[0], callback);
            }
            return;
        }
        if (typeof _required[url] == 'undefined') {
            // Haven't loaded this URL yet; gogogo!
            _required[url] = [];

            var script = new Element('script', {
                src: url,
                type: 'text/javascript'
            });
            script.observe('load', function() {
                console.log("script " + url + " loaded.");
                _required[url].each(function(cb) {
                    cb.call(); // TODO: does this execute in the right context?
                });
                _required[url] = true;
            });

            $$('head')[0].insert(script);
        } else if (typeof _required[url] == 'boolean') {
            // We already loaded the thing, so go ahead.
            if (callback) {
                callback.call();
            }
            return;
        }

        if (callback) {
            _required[url].push(callback);
        }
    });
})();

使用:

<script src="prototype.js"></script>
<script src="require.js"></script>
<script>
    require(['foo.js','bar.js'], function () {
        /* Use foo.js and bar.js here */
    });
</script>

地址: http://gist.github.com/284442.

这里是一个基本插件,允许您使用 @import “path/to/file.js”; syntax 在任何文件中,包括JavaScript文件。

它可以通过 npm 安装安装: https://npmjs.org/package/grunt-import

如果您打算上传 JavaScript 文件使用所引入/包含的文件中的功能,您也可以定义全球对象,并将功能定义为对象项目。

世界.js

A = {};

文件1JS

A.func1 = function() {
  console.log("func1");
}

文件2JS

A.func2 = function() {
  console.log("func2");
}

主.js

A.func1();
A.func2();

您只需在 HTML 文件中包含脚本时要小心,命令应该如下:

<head>
  <script type="text/javascript" src="global.js"></script>
  <script type="text/javascript" src="file1.js"></script>
  <script type="text/javascript" src="file2.js"></script>
  <script type="text/javascript" src="main.js"></script>
</head>
var xxx = require("../lib/your-library.js")

import xxx from "../lib/your-library.js" //get default export
import {specificPart} from '../lib/your-library.js' //get named export
import * as _name from '../lib/your-library.js'  //get full export to alias _name

我用另一种方法尝试了这个问题。

命令导入脚本,在这里没有效应。

標籤:HTML

<!doctype html>
<html lang="en">
<head>
    <meta charset="utf-8">
    <title>Trials</title>
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <script src="main.js"></script>
    <script src="scriptA.js"></script>
</head>

<body>
<h3>testing js in js (check console logs)</h3>
<button onclick="fnClick()">TEST</button>
</body>

</html>

主.js

function fnClick() {
  console.log('From\tAAAAA');
  var pro = myExpo.hello();
  console.log(pro);
}

编辑:JS

myExpo = {
    hello: function () {
        console.log('From\tBBBBB');
        return "Hello";
    }
}

而结果是

From    AAAAA
From    BBBBB
Hello