Answer 1

搜到一篇资料详细解释了flex-grow与flex-shrink。详解 flex-grow 与 flex-shrink

Answer 2

function addEvent (type, el, fn) {
    if (window.addEventListener) {
        addEvent = function (type, el, fn) {
            el.addEventListener(type, fn, false);
        }
    }
    else if(window.attachEvent){
        addEvent = function (type, el, fn) {
            el.attachEvent('on' + type, fn);
        }
    }
}

如果我没理解错，这段函数，在第一次执行的时候，addEvent并不会绑定事件，只是对addEvent重新赋值了一次，这样修改如何？

function addEvent (type, el, fn) {
    if (window.addEventListener) {
        el.addEventListener(type, fn, false);
        addEvent = function (type, el, fn) {
            el.addEventListener(type, fn, false);
        }
    }
    else if(window.attachEvent){
        el.attachEvent('on' + type, fn);
        addEvent = function (type, el, fn) {
            el.attachEvent('on' + type, fn);
        }
    }
}

或者立即执行它