常用工具函数

function getQueryString(name) {
　　if (window.location.href.indexOf("?") != window.location.href.lastIndexOf("?"))
　　var urls = window.location.href.replace(/\?/g, "&").replace(/^.*?&/, "")
　　else
　　var urls = window.location.href.replace(/^.*\?/, "");
　　var reg = new RegExp("(^|&)" + name + "=([^&]*)(&|$)", "i");
　　var r = ("?" + urls).substr(1).match(reg);
　　if (r != null) return unescape(r[2]);
　　return null;
}