js获取url参数，操作url参数

function getParam(key) {
    var tmp = location.search;
    tmp = decodeURIComponent(tmp);
    var index = tmp.indexOf(key);
    var length = key.length;
    var value;
    if(index != -1){
        var start = index+length+1;
        var end = tmp.indexOf('&',start);
        if(end == -1){
           value = tmp.slice(start);
        }
        else{
            value = tmp.slice(start,end);
        }
    }
    else{
        value = '';
    }
    return value;
}

console.log( getParam('userid') ); // xxx

js 设置url参数

setParam:function (url,key,val) {
        var link = url;
        var tmp = '';
        if(link.indexOf('?') >  ){
            tmp = link.substr( link.indexOf('?') );  // ?status=all
        }
        tmp = decodeURIComponent(tmp);
        link = decodeURIComponent(link);
        if(!tmp){
            link = link + '?' + key + '=' + val + '&';
        }
        else{
            var ind = tmp.indexOf(key);
            if(ind <  ){ // 不存在这个key
                ind = link.indexOf('?')+;
                var qianzhi = link.substr(,ind);
                var houzhi = link.substr(ind);
                link = qianzhi + key + '=' + val + '&' + houzhi;
            }
            else{  //已有这个key,则更新这个key对应的值
                ind = link.indexOf(key);
                var qianzhi = link.substr(,ind);
                var ind2 = link.indexOf('&',ind);
                var houzhi = link.substr(ind2);
                link = qianzhi + key + '=' + val + houzhi;
            }
        }
        return link;
    },

js 移除url参数

dropParam:function (url,key) {
        var link = url;
        var tmp = '';
        if(link.indexOf('?') >  ){
            tmp = link.substr( link.indexOf('?') );  // ?status=all
        }
        tmp = decodeURIComponent(tmp);
        link = decodeURIComponent(link);
        if(tmp){
            if( tmp.indexOf(key) >){
                var ind = link.indexOf(key);
                var qianzhi = link.substr(,ind);
                var ind2 = link.indexOf('&',ind);
                var houzhi = link.substr(ind2+);
                link = qianzhi+houzhi;
            }
        }
        return link;
    },