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
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>
其他回答
我写了一个简单的模块,它自动化了在JavaScript中进口/包含模块脚本的工作。 详细解释代码,请参阅博客帖子JavaScript需要/进口/包含模块。
// ----- USAGE -----
require('ivar.util.string');
require('ivar.net.*');
require('ivar/util/array.js');
require('http://ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js');
ready(function(){
//Do something when required scripts are loaded
});
//--------------------
var _rmod = _rmod || {}; //Require module namespace
_rmod.LOADED = false;
_rmod.on_ready_fn_stack = [];
_rmod.libpath = '';
_rmod.imported = {};
_rmod.loading = {
scripts: {},
length: 0
};
_rmod.findScriptPath = function(script_name) {
var script_elems = document.getElementsByTagName('script');
for (var i = 0; i < script_elems.length; i++) {
if (script_elems[i].src.endsWith(script_name)) {
var href = window.location.href;
href = href.substring(0, href.lastIndexOf('/'));
var url = script_elems[i].src.substring(0, script_elems[i].length - script_name.length);
return url.substring(href.length+1, url.length);
}
}
return '';
};
_rmod.libpath = _rmod.findScriptPath('script.js'); //Path of your main script used to mark
//the root directory of your library, any library.
_rmod.injectScript = function(script_name, uri, callback, prepare) {
if(!prepare)
prepare(script_name, uri);
var script_elem = document.createElement('script');
script_elem.type = 'text/javascript';
script_elem.title = script_name;
script_elem.src = uri;
script_elem.async = true;
script_elem.defer = false;
if(!callback)
script_elem.onload = function() {
callback(script_name, uri);
};
document.getElementsByTagName('head')[0].appendChild(script_elem);
};
_rmod.requirePrepare = function(script_name, uri) {
_rmod.loading.scripts[script_name] = uri;
_rmod.loading.length++;
};
_rmod.requireCallback = function(script_name, uri) {
_rmod.loading.length--;
delete _rmod.loading.scripts[script_name];
_rmod.imported[script_name] = uri;
if(_rmod.loading.length == 0)
_rmod.onReady();
};
_rmod.onReady = function() {
if (!_rmod.LOADED) {
for (var i = 0; i < _rmod.on_ready_fn_stack.length; i++){
_rmod.on_ready_fn_stack[i]();
});
_rmod.LOADED = true;
}
};
_.rmod = namespaceToUri = function(script_name, url) {
var np = script_name.split('.');
if (np.getLast() === '*') {
np.pop();
np.push('_all');
}
if(!url)
url = '';
script_name = np.join('.');
return url + np.join('/')+'.js';
};
//You can rename based on your liking. I chose require, but it
//can be called include or anything else that is easy for you
//to remember or write, except "import", because it is reserved
//for future use.
var require = function(script_name) {
var uri = '';
if (script_name.indexOf('/') > -1) {
uri = script_name;
var lastSlash = uri.lastIndexOf('/');
script_name = uri.substring(lastSlash+1, uri.length);
}
else {
uri = _rmod.namespaceToUri(script_name, ivar._private.libpath);
}
if (!_rmod.loading.scripts.hasOwnProperty(script_name)
&& !_rmod.imported.hasOwnProperty(script_name)) {
_rmod.injectScript(script_name, uri,
_rmod.requireCallback,
_rmod.requirePrepare);
}
};
var ready = function(fn) {
_rmod.on_ready_fn_stack.push(fn);
};
您可以使用我的 loadScript ES 模块来加载 JavaScript 文件。
使用:
在您的标签中,包含下列代码:
<script src="https://raw.githack.com/anhr/loadScriptNodeJS/master/build/loadScript.js"></script>
或
<script src="https://raw.githack.com/anhr/loadScriptNodeJS/master/build/loadScript.min.js"></script>
现在,您可以使用 window.loadScript 加载您的 JavaScript 文件。
loadScript.async( src, [选项] )
无同步加载 JavaScript 文件。
src:一个外部脚本文件或脚本文件名序列的URL。
选项:以下选项可用
onload: function () The onload event occurs when a script has been loaded. Default is undefined.
onerror: function ( str, e ) The onerror event occurs when an error has been occurred. The default is undefined.
str: error details
e: event
appendTo: The node to which the new script will be append. The default is the head node.
例如
loadScript.async( "JavaScript.js",
{
onload: function () {
var str = 'file has been loaded successfully';
console.log( str );
},
onerror: function ( str, e ) {
console.error( str );
},
} );
使用的例子
也许你可以使用我在此页面上发现的这个功能 如何将JavaScript文件纳入JavaScript文件中?
function include(filename)
{
var head = document.getElementsByTagName('head')[0];
var script = document.createElement('script');
script.src = filename;
script.type = 'text/javascript';
head.appendChild(script)
}
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.
var js = document.createElement("script");
js.type = "text/javascript";
js.src = jsFilePath;
document.body.appendChild(js);
