getCurrentScript

getCurrentScript.js

var getCurrentScript = (function () {
    var supportsScriptReadyState = ('readyState' in document.createElement('script'))
    var isNotOpera = !window.opera || window.opera.toString() !== "[object Opera]"

    function getCurrentScript() {
        if (document.currentScript) {
            // Chrome, OSX Safari, Firefox, Edge
            return document.currentScript.src
        }

        if (supportsScriptReadyState && isNotOpera) {
            // IE 6, 7, 8, 9, 10
            var scripts = document.getElementsByTagName('script')
            var i = scripts.length
            while (i--) {
                var tag = scripts[i]
                if (tag.readyState === 'interactive') {
                    return tag.src
                }
            }
        }

        // IE11, windows Safari
        var stack
        try {
            a.b.c() // 强制报错,以便捕获e.stack
        } catch (e) {
            // windows safari的错误对象只有line,sourceId,sourceURL
            if (typeof e.sourceURL === 'string') {
                return e.sourceURL
            }
            stack = e.stack
            if (!stack && window.opera) {
                //opera 9没有e.stack,但有e.Backtrace,但不能直接取得,需要对e对象转字符串进行抽取
                stack = (String(e).match(/of linked script \S+/g) || []).join(" ")
            }
        }
        if (stack) {
            /**
             * e.stack最后一行在所有支持的浏览器大致如下:
            *chrome23:
            * at http://113.93.50.63/data.js:4:1
            *firefox17:
            *@http://113.93.50.63/query.js:4
            *opera12:
            *@http://113.93.50.63/data.js:4
            *IE10:
            *  at Global code (http://113.93.50.63/data.js:4:1)
            */
            stack = stack.split(/[@ ]/g).pop() // 取得最后一行,最后一个空格或@之后的部分
            stack = stack[0] == "(" ? stack.slice(1, -1) : stack
            return stack.replace(/(:\d+)?:\d+$/i, "") // 去掉行号与或许存在的出错字符起始位置
        }
    }
    return getCurrentScript
})()