If we for a second imagine that we have server-side javascript with a print() function:
var a=1,b=2;
var func=function() { alert(a+b); }print("<html><head><script>\n");
print("var func="+as_code(func)+"\n");
print("func();\n");
print("</script></head><body></body></html>");This would cause the browser to show an alert saying "3".