常用示例

1）js

//判断滚动停止demo  

var aa = $(window).scrollTop();
    var tt;
    var bb = 0;
    $(window).bind('scroll', function(){
        bb = $(window).scrollTop();
        if(tt == null){
            tt = setInterval(function(){
                aa = $(window).scrollTop();
                if(aa == bb){
                    console.log('滚动停止');
                    clearInterval(tt);
                    tt = null;
                }
            },1000)
        }
    })

 

2）css

/*chrome禁止选中*/
        #mydiv{
            user-select : none ;
            touch-callout : none ;
            user-drag : none ;
            tap-highlight-color : rgba(0,0,0,0) ;

            -webkit-user-select : none ;
            -webkit-touch-callout : none ;
            -webkit-user-drag : none ;
            -webkit-tap-highlight-color : rgba(0,0,0,0) ;
        }

3:javascript:void(0);

1:https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/void?redirectlocale=en-US&redirectslug=JavaScript%2FReference%2FOperators%2Fvoid

2:http://www.zhangxinxu.com/wordpress/2013/01/why-use-href-javascript-void0/

When a browser follows a javascript: URI, it evaluates the code in the URI and then replaces the contents of the page with the returned value, unless the returned value is undefined. The void operator can be used to return undefined.

<a href="javascript:void(0);">Click here to do nothing</a>
<a href="javascript:void(document.body.style.backgroundColor='green');">Click here for green background</a>