<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title></title>
<script type="text/javascript">
window.onload = function () {
var str = "a a a adb daf sdf";
var reg = /\s+/g;//\s 匹配任何不可见字符，包括空格、制表符、换页符等等。等价于[ \f\n\r\t\v]。
var result = str.replace(reg, "");
console.log(result); var reg1 = /^\s+|\s+$/g;
String.prototype.btrim = function () {
this;
var reg1 = /^\s+|\s+$/g;
return this.replace(reg, '');
}
str.trim();//给字符串拓展一个方法 var str4 = 'dfdddddddddddddddddd';
var reg4 = /d+/g;
var re = str4.match(reg4);
console.log(re);
};
</script>
</head>
<body> </body>
</html>