下面是他们的字符串规则：
1、<(script|link|style|iframe)(.|\n)*<\/\1>\s*
2、\s*on[a-z]+\s*=\s*("[^"]+"|'[^']+'|[^\s]+)\s*(?=>)
3、\s*(href|src)\s*=\s*("\s*(javascript|vbscript):[^"]+"|'\s*(javascript|vbscript):[^']+'|(javascript|vbscript):[^\s]+)\s*(?=>)
4、epression\((.|\n)*\);?
了解他们的规则后，抓虫行动就水到渠成。
<textarea id="bug" cols="80" rows="16">
<button id="kick">抓虫1</button>
<script>
function kickBug(str) {
return str.replace(/<(script|link|style|iframe)(.|\n)*\/\1>\s*/ig,"");
}
</script>
<iframe></iframe>
<link href='test.css'></link>
<style>
a {
height:expression(alert('hei'));
}
</style>
</textarea>
<button id="kick">抓虫1</button>
<script>
function kickBug(str) {
return str.replace(/<(script|link|style|iframe)(.|\n)*\/\1>\s*/ig,"");
}
if(!/msie/i.test(navigator.userAgent)){
HTMLElement.prototype.__defineGetter__("innerText",function(){
return this.textContent;
});
HTMLElement.prototype.__defineSetter__("innerText",function(text){
this.textContent = text;
});
}
document.getElementById("kick").onclick = function() {
var bug = document.getElementById("bug");
bug.innerText = kickBug(bug.innerText);
}
</script><textarea id="bug" cols="80" rows="5">
<a onclick="test();
test1()" onblur=
"test3()">test</a>
</textarea>
<button id="kick">抓虫2</button>
<script>
function kickBug(str) {
return str.replace(/<[a-z][^>]*\s*on[a-z]+\s*=[^>]+/ig,function($0,$1){
return $0.replace(/\s*on[a-z]+\s*=\s*("[^"]+"|'[^']+'|[^\s]+)\s*/ig,"");
});
}
if(!/msie/i.test(navigator.userAgent)){
HTMLElement.prototype.__defineGetter__("innerText",function(){
return this.textContent;
});
HTMLElement.prototype.__defineSetter__("innerText",function(text){
this.textContent = text;
});
}
document.getElementById("kick").onclick = function() {
var bug = document.getElementById("bug");
bug.innerText = kickBug(bug.innerText);
}
</script><textarea id="bug" cols="80" rows="5">
<a onclick="test();" href="
jAvascript:alert('a')" href="jAvascript:"
href="vbscript:alert()"
>test</a>
</textarea>
<button id="kick">抓虫3</button>
<script>
function kickBug(str) {
return str.replace(/<[a-z][^>]*\s*(href|src)\s*=[^>]+/ig,function($0,$1){
$0 = $0.replace(/&#(6[5-9]|[78][0-9]|9[07]|1[01][0-9]|12[012]);?/g,function($0,$1){return String.fromCharCode($1);});
return $0.replace(/\s*(href|src)\s*=\s*("\s*(javascript|vbscript):[^"]+"|'\s*(javascript|vbscript):[^']+'|(javascript|vbscript):[^\s]+)/ig,"");
});
}
if(!/msie/i.test(navigator.userAgent)){
HTMLElement.prototype.__defineGetter__("innerText",function(){
return this.textContent;
});
HTMLElement.prototype.__defineSetter__("innerText",function(text){
this.textContent = text;
});
}
document.getElementById("kick").onclick = function() {
var bug = document.getElementById("bug");
bug.innerText = kickBug(bug.innerText);
}
</script><textarea id="bug" cols="80" rows="5">
expression()
<a style="color:expression(
'red'
)">test</a>
</textarea>
<button id="kick">抓虫4</button>
<script>
function kickBug(str) {
return str.replace(/<[a-z][^>]*\s*style\s*=[^>]+/ig,function($0,$1){
$0 = $0.replace(/&#(6[5-9]|[78][0-9]|9[07]|1[01][0-9]|12[012]);?/g,function($0,$1){return String.fromCharCode($1);});
return $0.replace(/\s*style\s*=\s*("[^"]+(expression)[^"]+"|'[^']+\2[^']+'|[^\s]+\2[^\s]+)\s*/ig,"");
});
}
if(!/msie/i.test(navigator.userAgent)){
HTMLElement.prototype.__defineGetter__("innerText",function(){
return this.textContent;
});
HTMLElement.prototype.__defineSetter__("innerText",function(text){
this.textContent = text;
});
}
document.getElementById("kick").onclick = function() {
var bug = document.getElementById("bug");
bug.innerText = kickBug(bug.innerText);
}
</script>这样调用就可以
k1(k2(k3(k4(str))))
这样就是单纯地过滤脚本而已，所谓过滤“危险脚本”应该是能够判断哪些属于“危险"脚本，不危险的就不过滤才对……那可就难办了，相当于防火墙了。
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