eval、escape和unescape ,帮我解释下这段代码

<SCRIPT LANGUAGE="JavaScript"><!--
eval(unescape("%76%61%72%20%6F%43%5F%2C%6F%53%5F%3D%22%22%2C%50%5F%2C%42%5F%2C%42%5F%62%2C%69%42%5F%3D%37%2C%54%5F%53%3D%31%3C%3C%31%35%2C%4D%5F%56%3D%54%5F%53%2D%31%2C%4E%5F%3D%31%32%38%2C%44%5F%6C%3D%6E%65%77%20%41%72%72%61%79%28%54%5F%53%29%3B%66%6F%72%28%76%61%72%20%69%3D%30%3B%69%3C%54%5F%53%3B%69%2B%2B%29%7B%69%66%28%69%3C%31%32%38%29%44%5F%6C%5B%69%5D%3D%53%74%72%69%6E%67%2E%66%72%6F%6D%43%68%61%72%43%6F%64%65%28%69%29%3B%65%6C%73%65%20%44%5F%6C%5B%69%5D%3D%22%22%7D%3B%66%75%6E%63%74%69%6F%6E%20%63%63%31%28%73%29%7B%76%61%72%20%72%2C%63%3B%77%68%69%6C%65%20%28%42%5F%3C%69%42%5F%29%7B%69%66%28%50%5F%3D%3D%73%2E%6C%65%6E%67%74%68%29%72%65%74%75%72%6E%20%4D%5F%56%3B%63%3D%73%2E%63%68%61%72%43%6F%64%65%41%74%28%50%5F%2B%2B%29%3B%69%66%28%63%3E%31%32%37%29%7B%6F%53%5F%2B%3D%53%74%72%69%6E%67%2E%66%72%6F%6D%43%68%61%72%43%6F%64%65%28%63%29%3B%6F%43%5F%3D%4D%5F%56%7D%65%6C%73%65%7B%42%5F%62%3D%28%42%5F%62%3C%3C%37%29%7C%63%3B%42%5F%2B%3D%37%7D%7D%72%3D%42%5F%62%3E%3E%28%42%5F%2D%69%42%5F%29%3B%42%5F%62%3D%42%5F%62%5E%28%72%3C%3C%28%42%5F%2D%69%42%5F%29%29%3B%42%5F%3D%42%5F%2D%69%42%5F%3B%69%66%28%72%3D%3D%30%29%7B%69%42%5F%2B%2B%3B%72%65%74%75%72%6E%20%63%63%31%28%73%29%7D%72%65%74%75%72%6E%20%72%7D%66%75%6E%63%74%69%6F%6E%20%63%63%30%28%73%29%7B%50%5F%3D%30%3B%42%5F%3D%30%3B%6F%53%5F%3D%22%22%3B%42%5F%62%3D%30%3B%76%61%72%20%6F%3D%22%22%2C%63%3D%22%22%2C%6E%63%2C%64%73%3D%22%22%2C%61%72%3D%6E%65%77%20%41%72%72%61%79%28%29%2C%69%63%3D%30%3B%6F%43%5F%3D%4D%5F%56%3B%77%68%69%6C%65%28%28%6E%63%3D%63%63%31%28%73%29%29%21%3D%4D%5F%56%29%7B%69%66%28%6F%43%5F%3D%3D%4D%5F%56%29%64%73%3D%44%5F%6C%5B%6E%63%5D%3B%65%6C%73%65%7B%69%66%28%6E%63%3E%3D%4E%5F%29%64%73%3D%44%5F%6C%5B%6F%43%5F%5D%2B%63%3B%65%6C%73%65%20%64%73%3D%44%5F%6C%5B%6E%63%5D%7D%6F%53%5F%3D%6F%53%5F%2B%64%73%3B%69%66%28%6F%53%5F%2E%6C%65%6E%67%74%68%3E%38%30%29%7B%61%72%5B%69%63%2B%2B%5D%3D%6F%53%5F%3B%6F%53%5F%3D%22%22%7D%63%3D%64%73%2E%63%68%61%72%41%74%28%30%29%3B%69%66%28%4E%5F%3C%4D%5F%56%26%26%6F%43%5F%21%3D%4D%5F%56%29%7B%44%5F%6C%5B%4E%5F%2B%2B%5D%3D%44%5F%6C%5B%6F%43%5F%5D%2B%63%7D%6F%43%5F%3D%6E%63%7D%6F%3D%61%72%2E%6A%6F%69%6E%28%22%22%29%2B%6F%53%5F%3B%64%6F%63%75%6D%65%6E%74%2E%77%72%69%74%65%28%6F%29%7D"));//--></SCRIPT>
帮我解密还原下

解决方案 »

  1.   


    <SCRIPT LANGUAGE="JavaScript"> <!--
        var a=(unescape("%76%61%72%20%6F%43%5F%2C%6F%53%5F%3D%22%22%2C%50%5F%2C%42%5F%2C%42%5F%62%2C%69%42%5F%3D%37%2C%54%5F%53%3D%31%3C%3C%31%35%2C%4D%5F%56%3D%54%5F%53%2D%31%2C%4E%5F%3D%31%32%38%2C%44%5F%6C%3D%6E%65%77%20%41%72%72%61%79%28%54%5F%53%29%3B%66%6F%72%28%76%61%72%20%69%3D%30%3B%69%3C%54%5F%53%3B%69%2B%2B%29%7B%69%66%28%69%3C%31%32%38%29%44%5F%6C%5B%69%5D%3D%53%74%72%69%6E%67%2E%66%72%6F%6D%43%68%61%72%43%6F%64%65%28%69%29%3B%65%6C%73%65%20%44%5F%6C%5B%69%5D%3D%22%22%7D%3B%66%75%6E%63%74%69%6F%6E%20%63%63%31%28%73%29%7B%76%61%72%20%72%2C%63%3B%77%68%69%6C%65%20%28%42%5F%3C%69%42%5F%29%7B%69%66%28%50%5F%3D%3D%73%2E%6C%65%6E%67%74%68%29%72%65%74%75%72%6E%20%4D%5F%56%3B%63%3D%73%2E%63%68%61%72%43%6F%64%65%41%74%28%50%5F%2B%2B%29%3B%69%66%28%63%3E%31%32%37%29%7B%6F%53%5F%2B%3D%53%74%72%69%6E%67%2E%66%72%6F%6D%43%68%61%72%43%6F%64%65%28%63%29%3B%6F%43%5F%3D%4D%5F%56%7D%65%6C%73%65%7B%42%5F%62%3D%28%42%5F%62%3C%3C%37%29%7C%63%3B%42%5F%2B%3D%37%7D%7D%72%3D%42%5F%62%3E%3E%28%42%5F%2D%69%42%5F%29%3B%42%5F%62%3D%42%5F%62%5E%28%72%3C%3C%28%42%5F%2D%69%42%5F%29%29%3B%42%5F%3D%42%5F%2D%69%42%5F%3B%69%66%28%72%3D%3D%30%29%7B%69%42%5F%2B%2B%3B%72%65%74%75%72%6E%20%63%63%31%28%73%29%7D%72%65%74%75%72%6E%20%72%7D%66%75%6E%63%74%69%6F%6E%20%63%63%30%28%73%29%7B%50%5F%3D%30%3B%42%5F%3D%30%3B%6F%53%5F%3D%22%22%3B%42%5F%62%3D%30%3B%76%61%72%20%6F%3D%22%22%2C%63%3D%22%22%2C%6E%63%2C%64%73%3D%22%22%2C%61%72%3D%6E%65%77%20%41%72%72%61%79%28%29%2C%69%63%3D%30%3B%6F%43%5F%3D%4D%5F%56%3B%77%68%69%6C%65%28%28%6E%63%3D%63%63%31%28%73%29%29%21%3D%4D%5F%56%29%7B%69%66%28%6F%43%5F%3D%3D%4D%5F%56%29%64%73%3D%44%5F%6C%5B%6E%63%5D%3B%65%6C%73%65%7B%69%66%28%6E%63%3E%3D%4E%5F%29%64%73%3D%44%5F%6C%5B%6F%43%5F%5D%2B%63%3B%65%6C%73%65%20%64%73%3D%44%5F%6C%5B%6E%63%5D%7D%6F%53%5F%3D%6F%53%5F%2B%64%73%3B%69%66%28%6F%53%5F%2E%6C%65%6E%67%74%68%3E%38%30%29%7B%61%72%5B%69%63%2B%2B%5D%3D%6F%53%5F%3B%6F%53%5F%3D%22%22%7D%63%3D%64%73%2E%63%68%61%72%41%74%28%30%29%3B%69%66%28%4E%5F%3C%4D%5F%56%26%26%6F%43%5F%21%3D%4D%5F%56%29%7B%44%5F%6C%5B%4E%5F%2B%2B%5D%3D%44%5F%6C%5B%6F%43%5F%5D%2B%63%7D%6F%43%5F%3D%6E%63%7D%6F%3D%61%72%2E%6A%6F%69%6E%28%22%22%29%2B%6F%53%5F%3B%64%6F%63%75%6D%65%6E%74%2E%77%72%69%74%65%28%6F%29%7D"));//-->
        alert(a)</SCRIPT>