<!DOCTYPE html>
<html>
<head>
<title></title>
</head>
<body>
<input type="text" id="test"/>
<input type="button" value="test" id="btn_test" onclick="tt()" />
<script>
function tt() {
var t = document.getElementById("test").value
var patt1 = new RegExp(/\s+/g);
if (patt1.test(t)) {
alert("有空格");
}
alert(t.replace(/\s+/g, ""));
}
</script>
</body>
</html>