求一段正则表达 急啊！

Question

就是把一段 string 里面的 <script>alert("a");</script>
换成 &lt;script&gt;alert(&quot;a&quot;);&lt;/script&gt;有个小要求就是 string 里面其它的 html tag 如 <p> <div> 都不要换，只针对 <script>内容而已

Answer 1

var a='<script>alert("a");<'+'/script>';
a=a.replace(/<\/?script>/g,function(x){
return x.replace("<","&lt;").replace(">",'&gt;');
})
alert(a);

Answer 2

var a='<script>alert("a");<'+'/script>';
alert(a.replace(/\</g,"&lt;").replace(/\>/g,'&gt;'));

Answer 3

还要考虑：<script type="text/javascript">XXOO</script><script type="text/javascript">
    var a='<script type="text/javascript">alert("a");<\/script>';
    a=a.replace(/<\/?script[^>]*>/g,function(x){
        return x.replace(/</g,"&lt;").replace(/>/g,"&gt;").replace(/"/g,"&quot;");
    });
    alert(a);
</script>

Answer 4

<script type="text/javascript">
    var a='<script type="text/javascript">alert("a");<\/script>';
    a=a.replace(/<\/?script[^>]*>/g,function(x){
        return x.replace(/</g,"&lt;").replace(/>/g,"&gt;").replace(/"/g,"&quot;");
    });
</script>