js中获取当前执行脚本的位置

var whereAmI = function(){
	var jsPath = document.currentScript ? document.currentScript.src : function(){
	    var js = document.scripts
	        ,last = js.length - 1
	        ,src;
	    for(var i = last; i > 0; i--){
	        if(js[i].readyState === 'interactive'){
	            src = js[i].src;
	            break;
	        }
	    }
	    return src || js[last].src;
	}();
	return jsPath.substring(0, jsPath.lastIndexOf('/') + 1);
}();