Pass variable from JavascriptExecutor to Java Variable [duplicate]

Hello i am using Selenium with Java , trying to convert JavascriptExecutor inside script var to Java String . actually i have written a js method to get clicked element. I am trying to fetch clicked element's attribute .

Here is my Code :

    js.executeScript("document.body.addEventListener(\"click\", function (evt) {\n"
                    + "    console.dir(this);\n"
                    + "    //note evt.target can be a nested element, not the body element, resulting in misfires\n"
                    + "    var t = evt.target;\n"
                    + "    alert(t;\n"
                    + "});");`

i want to get alerted value 't' to Java String. like :

String ele = t;