js 路徑改變時獲取url參數

當我們在使用react或vue的router作路由跳轉時，為了保持菜單與地址欄狀態一致，我們可以使用window.onhashchange捕獲#后面的變化

    window.onhashchange = (hash)=> {
        var newHash = this.getHashKeyByUrl(hash.newURL);
        if(newHash == this.getHashKeyByUrl(hash.oldURL)){
            return;
        }
        // this.setState({curSelectedMenuKey:[newHash]});
        console.log("url參數-->",newHash)
    };

    function getHashKeyByUrl(url){
        var reg = new RegExp(/#\/(.*)?/);
        var matches =url.match(reg);
        if(matches && matches.length>=2 && matches[1]!=undefined){
            return matches[1];
        }else{
            return null;
        }
    }