仅用[]()+!等符号就足以实现几乎任意Javascript代码_javascript技巧

请在Firefox下测试

看了下例子:
js代码
<script> <BR>alert("hi there") <BR></script>
就等价于
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window["atob"]("0j9")[1]', <BR>@ window["atob"]("00A")[1]', <BR>A (+[]+[]["constructor"])[10]', <BR>B (+[]+(false)["constructor"])[10]', <BR>C window["atob"]("00N")[1]', <BR>D window["btoa"](00)[1]', <BR>E window["btoa"](01)[2]', <BR>F (0+[]["filter"]["constructor"])[10]', <BR>G window["btoa"]("0f")[1]', <BR>H window["btoa"]("0t")[1]', <BR>I ("Infinity")[0]', <BR>J window["atob"]("00r")[1]', <BR>K window["btoa"]("(")[0]', <BR>L window["btoa"]("/")[0]', <BR>M window["btoa"](0)[0]', <BR>N ("NaN")[0]', <BR>O window["btoa"](8)[0]', <BR>P window["btoa"]("<")[0]', <BR>Q window["btoa"]("a")[1]', <BR>R window["atob"]("01I")[1]', <BR>S window["btoa"]("I")[0]', <BR>T window["btoa"]("N")[0]', <BR>U window["atob"]("01W")[1]', <BR>V window["atob"]("01a")[1]', <BR>W (true+window)[12]', <BR>X window["atob"]("01i")[1]', <BR>Y window["btoa"]("a")[0]', <BR>Z window["btoa"]("f")[0]', <BR>[ (undefined+[]["filter"])[33]', <BR>\ window["atob"]("01y")[1]', <BR>] (true+[]["filter"])[40]', <BR>^ window["atob"](014)[1]', <BR>_ window["atob"](018)[1]', <BR>` window["atob"]("02A")[1]', <BR>a ("false")[1]', <BR>b (window+[])[2]', <BR>c ([]["filter"]+[])[3]', <BR>d ("undefined")[2]', <BR>e ("true")[3]', <BR>f ("false")[0]', <BR>g ([]+("")["constructor"])[14]', <BR>h window["atob"]("aN")[0]', <BR>i ([false]+undefined)[10]', <BR>j (window+[])[3]', <BR>k window["atob"]("a0")[0]', <BR>l ("false")[2]', <BR>m (Number+[])[11]', <BR>n ("undefined")[1]', <BR>o (true+[]["filter"])[10]', <BR>p window["atob"]("cN")[0]', <BR>q window["atob"]("cf")[0]', <BR>r ("true")[1]', <BR>s ("false")[3]', <BR>t ("true")[0]', <BR>u ("undefined")[0]', <BR>v (0+[]["filter"])[30]', <BR>w ([]["sort"]["call"]()+[])[13]', <BR>x window["atob"]("eN")[0]', <BR>y (NaN+[Infinity])[10]', <BR>z window["atob"]("et")[0]', <BR>{ (NaN+[]["filter"])[21]', <BR>| window["atob"]("03y")[1]', <BR>} (NaN+[]["filter"])[41]', <BR>~ window["atob"](234)[1]' <BR> <BR>拼接出来字符串 "eval"，如何把 "eval" 变成 eval() 呢？方法是 <BR>[]["sort"]["call"]()["eval"] <BR>其中 []["sort"]["call"]() 等于 [].sort.call() ，等价于 window，所以上面 []["sort"]["call"]()["eval"] 就等价于 window.eval。 <BR>然后就是体力活了，把码表对应转换成 eval("blah blah") 这种形式就可以执行任意代码了 <BR>不同浏览器的码表不一样。Chrome和Firefox的index就不一样。 <BR>其实这个码表还可以通过 ·toLocal*()` 函数族扩展到Unicode，比fromCharCode要简短 <BR>原文:<A href="http://discogscounter.getfreehosting.co.uk/js-noalnum.php?txt=alert%28%22hi+there%22%29" target=_blank><FONT color=#810081>http://discogscounter.getfreehosting.co.uk/js-noalnum.php?txt=alert%28%22hi+there%22%29 </script>