禁止页面输入特殊字符

<input type="text" id="text1" />
<textarea id="textarea1"></textarea>
<script>
document.getElementById("text1").onkeypress = function(e){
checkChar(e);
}
document.getElementById("textarea1").onkeypress = function(e){
checkChar(e);
}

function checkChar(e){
e = window.event || e;
var code = e.keyCode || e.which;
var reg = /[////:/*/?"/</>/|]/;// 禁止 //:*?"<>|
if(reg.test(String.fromCharCode(code))){
if(window.event){
e.returnValue = false;
}else{
e.preventDefault();
}
}
}
</script>