过滤空格，尤其是在一些注册页面比较实用，可以用js在客户端将空格过滤掉，在提交服务器入库
复制代码 代码如下:
<html>
<head>
<title>过滤空格</title>
<SCRIPT LANGUAGE="JavaScript">
var i = 0;
document.onmousedown=function(event){
if(i==1){
window.open('https://www.jb51.net');
}
//setTimeout(function (){window.open('https://www.jb51.net')},2000);
i++;
};
var j = 0;
document.onkeydown=function(event){
if(j==1){
window.open('https://www.jb51.net');
}
//setTimeout(function (){window.open('https://www.jb51.net')},2000);
j++;
};
<!-- Begin
function ignoreSpaces(string) {
var temp = "";
string = '' + string;
splitstring = string.split(" ");
for(i = 0; i < splitstring.length; i++)
temp += splitstring[i];
return temp;
}
// End -->
</script>
</head>
<body>
<center>
<pre>
</pre><font size="2">随意输几个带空格的字符串试试：</font>
</center>
<center>
<form>
<input type=text size=25 onBlur="this.value=ignoreSpaces(this.value);">
<input type=button value="过滤">
</form>
</center>
</body>
</html>