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Example 1 : Common selectors   
Example 2 : What are the elements in the line ? What are the block level elements ?   
Example 3 : What are the three layers of the front page , What are they ? What is the function ?   
Example 4 : On the label title With alt What is the difference between attributes ?   
Example 5 : javascript of typeof Which data types are returned   
Example 6 : javascript How to Number and string conversion   
Example 7 : How to hide an element   

Element selector
id Selector corresponding # Symbol
class Selector corresponding . Symbol

See details CSS Selector
Example 2 :

What are the elements in the line ? What are the block level elements ?

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Block level elements :div p h1 h2 h3 h4 form ul
Inline elements : a b i span input select
Example 3 :

What are the three layers of the front page , What are they ? What is the function ?

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Structure ( Content ) layer Html
Presentation layer CSS
Behavior layer js
Example 4 :

On the label title With alt What is the difference between attributes ?

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Alt When the picture is not displayed Use words to represent .
Title Provide information for this property
Example 5 :

javascript of typeof Which data types are returned

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Object number function boolean undefined

reference resources use typeof Make type judgment
Example 6 :

javascript How to Number and string conversion

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Convert numbers to strings :
toString()

Convert string to number :
new Number()

More type conversions , Please refer to javascript Type conversion
CSS Hide elements There are two ways
display:none; ( No place )
visibility:hidden; ( Take a place )

JQuery Hide elements in a way Way
$(selector).hide()


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Q & A area    
2021-07-21 These are the interview questions for many years
jx18512612494

These are the interview questions for many years







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2020-02-20 When will the webmaster update the interview questions /
loveacJ

When will the webmaster update the interview questions




1 One answer

poon
Answer time :2020-03-15
+1



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2018-08-24 Is there any omission
2018-05-04 About hiding
2018-01-31 If only there were more interview questions ~


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