java截取字符串，求解

(function(){ var redirected= false; function redirect(){ if(!redirected){ redirected= true; vstCallback65({"code":200,"data":{"st":"1DUaywSfmetuwx5HRClaSNg"}}); } } var imgCounter = 0; if(0==imgCounter){ redirect(); return; } setTimeout(redirect,500); function loadImg(src) { function countDown() { imgCounter--; if (0 == imgCounter) { redirect(); } } var img = document.createElement("img"); img.onload = countDown; img.onerror = countDown; img.onabort = countDown; img.src = src; }; })();

截取1DUaywSfmetuwx5HRClaSNg

也就是lt的数据

求代码