获取url上的参数

如下：

    function GetQueryString (name) {
        var reg = new RegExp('(^|&)' + name + '=([^&]*)(&|$)', 'i')
        var r = window.location.search.substr(1).match(reg)
        if (r != null) return (r[2])
        return null
      }

url是 'https://www.a.com/?name=lisi';

  

var r = window.location.search.substr(1).match(reg)；

r //["name=lisi", "", "lisi", "", index: 0, input: "name=lisi", groups: undefined]