<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<title>每天一个JavaScript实例-去除字符串末尾的空白</title>
<script>
function white(){
var input = document.getElementById("inputid");
var lines = input.value.split("\n");
var resultString = "";
for (var i = 0; i < lines.length; i++){
var string = lines[i].trim();
resultString += string + "-";
}
alert(resultString);
}
</script>
</head>
<body>
<textarea id="inputid" placeholder="请输入多行字符串"></textarea>
<a href="#" onClick="white()">clickMe</a>
</body>
</html>
检测低版本浏览器，向下兼容：
if(typeof String.trim == "undefined")
String.prototype.trim = function(){
return this.replace(/(^\s*)|(\s*$)/g,"");
}
}原文：http://blog.csdn.net/waiting7436/article/details/39473375