1.
2. code
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<script>
window.onload = function () {
var oFilterBtn = document.getElementById("btn");
var aTxt = document.getElementsByTagName("textarea");
var reg = /菲律宾|日本|日|菊花/g
oFilterBtn.onclick = function () {
var result = ‘‘;
aTxt[1].value = aTxt[0].value.replace(reg, function (str) {
for (var i = 0; i < str.length; i++) {
result += "*";
}
return result;
});
};
};
</script>
</head>
<body>
<textarea cols="20" rows="10"></textarea><br>
<input id="btn" value="filter sensitiveWords" type="button" ><br>
<textarea cols="20" rows="10"></textarea>
</body>
</html>
原文：http://www.cnblogs.com/bravolove/p/6065949.html