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Frequently encountered problems in WEB front-end development Interview "continuous Update"

Source: Internet
Author: User
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    1. The difference between XHTML and HTML:
    • XHTML must end properly.
    • XHTML must be closed
    • XHTML tag names must be in lowercase letters
    • XHTML must have a root element
    • In XHTML, you need to assign a value to all properties
    • XHTML ' < ', ' > ',& and so on coded representations
    • In XHTML, do not write in comments--
    • The picture must have descriptive text, and the ALT attribute must have
    • Replace the name attribute with the id attribute

The difference between 2.HTML5 and HTML4

    • HTML5 simplifies the syntax, the HTML 4 Chinese document format is defined as: <! DOCTYPE HTML PUBLIC "-//w3c//dtd HTML 4.01 transitional//en" "Http://www.w3.org/TR/html4/loose.dtd", in HTML5, just write <!doctype html>;html 4 needs to write <script type= "Text/javascript" src= "File.js" ></script>, while in HTML5, just " Script src= "Code.js" ></script>
    • HTML5 replaces Flash with <canvas>
    • HTML5 added
    • Removed <b>, <font>, <frame>, <center>, <big> tags

3.JSON Introduction

    • Json:javascript Object Notation (JavaScript object Notation). JSON is a lightweight data interchange format that makes it easy to read, and makes the machine easy to parse;
    • JSON structure: "Name/value" pairs
    • JSON data can be transmitted using AJAX
    • Data is separated by commas
    • Curly braces represent objects, and brackets represent arrays

code example:

<script type= "Text/javascript" >

var jsonobject= {

"Name": "Bill Gates",

"Street": "Fifth Avenue New York 666",

"Age": 56,

"Phone": "555 1234567"};

document.getElementById ("Jname"). Innerhtml=jsonobject.name

document.getElementById ("Jage"). Innerhtml=jsonobject.age

document.getElementById ("Jstreet"). Innerhtml=jsonobject.street

document.getElementById ("Jphone"). Innerhtml=jsonobject.phone

</script>

Frequently encountered problems in WEB front-end development Interview "continuous Update"

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