什么是我的脚本src URL？

Question

是否有一种简单可靠的方法来确定当前正在执行的JavaScript文件的URL(在网页内)？

我唯一想到的是扫描DOM src以查找所有脚本属性以查找当前文件的引用方式,然后通过应用它来计算绝对URL document.location.任何人都有其他想法,是否有一些我完全忽略的超级简单方法？

更新:通过DOM访问的脚本元素已经具有src包含完整URL 的属性.我不知道它是多么普遍/标准,但是你可以使用getAttribute("src")哪个将返回[X] HTML中的任何原始属性值.

Answer 1

把它放在需要知道它自己的url的js文件中.

完全合格(例如http://www.example.com/js/main.js):

var scriptSource = (function(scripts) {
    var scripts = document.getElementsByTagName('script'),
        script = scripts[scripts.length - 1];

    if (script.getAttribute.length !== undefined) {
        return script.src
    }

    return script.getAttribute('src', -1)
}());

或者 它出现在源(例如/js/main.js)中:

var scriptSource = (function() {
    var scripts = document.getElementsByTagName('script'),
        script = scripts[scripts.length - 1];

    if (script.getAttribute.length !== undefined) {
        return script.getAttribute('src')
    }

    return script.getAttribute('src', 2)
}());

有关正在使用的参数的说明,请参阅http://www.glennjones.net/Post/809/getAttributehrefbug.htmgetAttribute(这是一个IE错误).

Answer 2

对于最近的浏览器,您可以使用document.currentScript来获取此信息.

var mySource = document.currentScript.src;

好处是它对于异步加载的脚本更可靠.缺点是,据我所知,它并非普遍支持.它应该适用于Chrome> = 29,FireFox> = 4,Opera> = 16.像许多有用的东西一样,它似乎在IE中不起作用.

当我需要获取脚本路径时,我会检查是否定义了document.currentScript,如果没有,则使用接受的答案中描述的方法.

if (document.currentScript) {
    mySource = document.currentScript.src;
} else {
    // code omitted for brevity
}

https://developer.mozilla.org/en-US/docs/Web/API/document.currentScript

Answer 3

因为它出现在源(例如/js/main.js)中,这是跨浏览器:

var scriptSource = (function() 
{ 
    var scripts = document.getElementsByTagName('script'), 
        script = scripts[scripts.length - 1]; 

    //No need to perform the same test we do for the Fully Qualified
    return script.getAttribute('src', 2); //this works in all browser even in FF/Chrome/Safari
}()); 

完全合格(例如http://www.example.com/js/main.js):

经过一些测试后,似乎很难以跨浏览器的方式获得完全合格的测试.Crescent Fresh建议 的解决方案在IE8中不起作用以获得完全合格,即使它在IE7中有效

Answer 4

此方法适用于延迟，异步和延迟加载，因为您知道脚本的文件名，并且文件名是否唯一

/* see  
 * http://stackoverflow.com/questions/984510/what-is-my-script-src-url/984656#984656
 * http://www.glennjones.net/Post/809/getAttributehrefbug.htm
 * 
 * iterate all script to find script with right filename
 * this work with async and defer (but your script MUST have a unique filemane)
 * mozilla support document.currentScript and we use it, if is set
 *
 * this will not work with local script loaded by jQuery.getScript(),
 * since there is no script tag added into the dom. the script is only evaluated in global space.
 * http://api.jquery.com/jQuery.getScript/
 *  
 * to fix this odd, you can add a reference in meta ( meta[name=srcipt][content=url] )
 * when you load the script
 */
var scriptFilename = 'jquery.plugins.template.js'; // don't forget to set the filename 
var scriptUrl = (function() {
    if (document.currentScript) { // support defer & async (mozilla only)
        return document.currentScript.src;
    } else {
        var ls,s;
        var getSrc = function (ls, attr) {
            var i, l = ls.length, nf, s;
            for (i = 0; i < l; i++) {
                s = null;
                if (ls[i].getAttribute.length !== undefined) { 
                    s = ls[i].getAttribute(attr, 2);                    
                }               
                if (!s) continue; // tag with no src
                nf = s;
                nf = nf.split('?')[0].split('/').pop(); // get script filename
                if (nf === scriptFilename) {
                    return s;
                }
            }
        };          
        ls = document.getElementsByTagName('script');
        s = getSrc(ls, 'src');
        if ( !s ) { // search reference of script loaded by jQuery.getScript() in meta[name=srcipt][content=url]
            ls = document.getElementsByTagName('meta');             
            s = getSrc(ls, 'content');
        }           
        if ( s ) return s;
    }
    return '';
})();

var scriptPath =  scriptUrl.substring(0, scriptUrl.lastIndexOf('/'))+"/";

带有它的jquery插件模板：https : //github.com/mkdgs/mkdgs-snippet/blob/master/javascript/jquery.plugins.template.js

注意：这不适用于jQuery.getScript（）加载的本地脚本，因为dom中没有添加脚本标签。仅在全局空间中评估脚本。 http://api.jquery.com/jQuery.getScript/

要修复它，您可以执行以下操作：

function loadScript(url,callback) {     

    if ( $('[src="'+url+'"]').length ) return true; // is already loaded    

    // make a reference of the loaded script
    if ( $('meta[content="'+url+'"]', $("head")).length ) return true; // is already loaded 
    var meta = document.createElement('meta');
    meta.content = url;
    meta.name = 'script';
    $("head").append(meta);

    return $.ajax({
          cache: true,
          url: u,
          dataType: 'script',
          async: false,
          success : function (script) {                     
                try { 
                    if ( typeof callback == 'function' ) callback();    
                } catch (error) { 
                    //console.log(error);
                }
          }
     });
}