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试着写博客系列（一）
大概18年开始，才正式全职做前端，到今天，大概有两年多时间了。
其实我从15年就开始接触前端了，当时一个师兄觉得我应该做前端，后来的个人发展轨迹表明，我并没有接受他的观点。
不知不觉年纪又大了，选定了前端，经验也不充足，我能做的是什么？
到了我这个年纪，按理说应该是技术专家了，可感觉自己这几年并没有多大的进步，我做的东西，可能在校的大学生也能完成。
惟有更加努力了。
console.log('hello world')
下面代码的输出结果
var a = {n: 1};
var b = a;
a.x = a = {n: 2};
console.log(a.x)
console.log(b.x)display: none; opacity: 0; visible: hidden; 三者比较
一、页面效果
display: none; // 不占据空间，不可点击
opacity: 0; // 占据空间，可点击
visible: hidden; // 占据空间，不可点击
二、对子元素的影响
display:none; 子元素都不可见；
opacity: 0; 子元素都不可见；
visible:hidden; 子元素设置为visible:visible，子元素依然可见。
三、性能
display：会引发重排，性能较差；
visible：会引发重绘，性能优于display;
opacity: 性能最高
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