写法1:
about:<form name=p><textarea name=t rows=11 cols=58></textarea><br><input onclick=document.p.t.value=escape(document.p.t.value) type=button value=加密><input onclick=document.p.t.value=unescape(document.p.t.value) type=button value=解密></form>
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写法2:
about:<form><textarea name=t rows=11 col