JavaScript屏蔽关键字

JavaScript屏蔽关键字，大概的思路就是去用javascript去替换已有的文本，达到替换的目的<mce:script language="javascript1.2"><!-- function test() { if((a.b.value.indexOf ("***") == 0)||(a.b.value.indexOf ("****") == 0)){ alert(":)"); a.b.focus(); return false;} } // --></mce:script> <form name=a onsubmit="return test()"> <input type=text name=b> <input type="submit" name="Submit" value="check"> </form>