learn-fron-end's Issues
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')
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
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)
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