js获取url参数值

效果：
代码：
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<script type="text/javascript">
window.onload = function(){
    document.getElementById("username").value = getUrlParam("username");
    document.getElementById("nickname").value = getUrlParam("nickname");
}

function getUrlParam(name) {
    var reg = new RegExp("(^|&)" + name + "=([^&]*)(&|$)");
    var r = decodeURI(window.location.search).substr(1).match(reg);
    if (r != null){
        return decodeURI(unescape(r[2]));
    }
    return null;
}
</script>
<title>点击获取url参数值</title>
</head>
<body>
    <a href="getUrlParam.html?username=hello你好&nickname=world世界" target="_blank">点击获取url参数值</a><br />
    参数username的值：<input id="username" readonly/><br />
    参数nickname的值：<input id="nickname" readonly/>
</body>
</html>