Front-end interview daily 3+1-day 870

Today's knowledge points (2021.09.02)-870th day ( I have to )

• [html] What are the methods to achieve the left, center and right three-column layout?
• [css] is the effective range of 16138acd3470e2 z-index in CSS3?
• [js] Write a method to remove the properties of the object whose value is empty ('','',null, undefined)
• [Soft Skill] Do you like to raise small animals?

In The Analects, Zeng Zi said: "My day and my body are three (I reflect on myself many times a day).
Front-end interview 3+1 questions every day, use interview questions to drive learning, and make a little progress every day!
Let hard work become a habit, let struggle become a kind of enjoyment!
Believe that insists on the power of ! !

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[Recommendation] Welcome to toss the front-end with jsliang, organize the front-end knowledge systematically, and currently toss LeetCode, intending to get through the two channels of both the algorithm and the data structure. GitHub address

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• Learning does not close, refueling is only for meet a better self , 365 days without holidays, every morning at 5 o'clock in the morning hand-published yourself, everyone 16138acd3472e0).
• I hope everyone in this exaggerated front-end circles, keeping calm , adhere to 20 minutes a day spent learning and thinking.
• In this ever-changing front-end with endless class libraries, it is recommended that you don't wait until you are looking for a job and then frantically learn every day! ( not forget the original intention of , html, css, javascript are the cornerstones!)

• Welcome to Issues communicate, encourage PR , thank Star , if you have any good suggestions, you can add me to WeChat to discuss together!

  I hope everyone learn and think about 16138acd3473b9 every , so as to achieve the purpose of coming here! ! ! (Don't come for anyone, come for yourself!)

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