<!DOCTYPE html> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /> <title>每天一個JavaScript實例-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="請輸入多行字符串"></textarea> <a href="#" onClick="white()">clickMe</a> </body> </html>檢測低版本瀏覽器，向下兼容：
if(typeof String.trim == "undefined") String.prototype.trim = function(){ return this.replace(/(^/s*)|(/s*$)/g,""); } }