地址栏解析参数

方法一：返回url所有参数

var queryUrlPar = function (url) { 
        url = url || window.location.href; 
        var reg = /([^?=&]+)=([^?=&]+)/g; 
        var obj = {}; 
        url.replace(reg, function () { 
            obj[arguments[1]] = arguments[2]; 
        }); 
        return obj; 
    } 
```

方法二：指定需要的参数名和url

var href= location.href="file:///C:/Users/Administrator/Desktop/demo.html?channel=12";
    console.log(getQuery('channel',href));
function getQuery(key, url) {
        url = url || window.location.href + '';
        if (url.indexOf('#') !== -1) {
            url = url.substring(0, url.indexOf('#'));
        }
        var rts = [], rt;
        var queryReg = new RegExp('(^|\\?|&)' + key + '=([^&]*)(?=&|#|$)', 'g');
        while ((rt = queryReg.exec(url)) != null) {
            rts.push(decodeURIComponent(rt[2]));
        }
        if (rts.length == 0) return null;
        if (rts.length == 1) return rts[0];
        return rts;
    }