| ACKNOWLEDGEMENT | 第1-6页 |
| ABSTRACT | 第6-8页 |
| 摘要 | 第8-10页 |
| CONTENTS | 第10-13页 |
| CHAPTER ONE Introduction | 第13-17页 |
| ·Introduction | 第13-14页 |
| ·Rationale of the Present Study | 第14页 |
| ·Objectives of the Present Study | 第14-15页 |
| ·Significance of the Present Study | 第15-16页 |
| ·Organization of the Present Study | 第16-17页 |
| CHAPTER TWO Literature | 第17-32页 |
| ·Introduction | 第17页 |
| ·Terminology | 第17-21页 |
| ·Code, Code-switching and Code-mixing | 第17-19页 |
| ·Code-switching Categories | 第19-20页 |
| ·Code-switching and Borrowing | 第20-21页 |
| ·Computer-mediated Communication | 第21-23页 |
| ·Review of Theories on Structures and Functions of Code-switching | 第23-32页 |
| ·Theories on Structures of Code-switching | 第23-25页 |
| ·Theories on Functions of Code-switching | 第25-30页 |
| ·Summary | 第30-32页 |
| CHAPTER THREE Theoretical Framework | 第32-37页 |
| ·Myers-Scotton's Matrix Language Frame Model | 第32-33页 |
| ·Terms under MLF | 第32页 |
| ·Identification of ML | 第32-33页 |
| ·Types of Constituents of Code-switching under MLF Model | 第33页 |
| ·Poplack's Typology Model of Code-switching | 第33-34页 |
| ·Tag Switching | 第33-34页 |
| ·Inter-sentential Switching | 第34页 |
| ·Intra-sentential Switching | 第34页 |
| ·Yu Guodong's Linguistic Adaptation Model | 第34-37页 |
| ·Adaptation to Linguistic Reality | 第35页 |
| ·Adaptation to Social Convention | 第35-36页 |
| ·Adaptation to Psychological Motivation | 第36-37页 |
| CHAPTER FOUR Methodology | 第37-42页 |
| ·Research Question | 第37页 |
| ·Operational Definitions of the Research Question | 第37-38页 |
| ·Data Source and Collecting Method | 第38-39页 |
| ·Data Analyzing Method | 第39-42页 |
| CHAPTER FIVE Data Analysis and Discussion | 第42-77页 |
| ·Structural Features of Code-switching in Online Chat Rooms | 第42-54页 |
| ·Embedded Language | 第42-44页 |
| ·Typology of Code-switching | 第44-48页 |
| ·Switched Elements of Foreign Language(s) | 第48-52页 |
| ·Words of Different Parts of Speech Participated in Lexical Code-switching | 第52-53页 |
| ·Summary | 第53-54页 |
| ·Functional Features of Code-switching in Online Chat Rooms | 第54-70页 |
| ·Code-switching Application in Adaptation Models | 第54-67页 |
| ·Functions of Code-switching not Covered in the Model | 第67-69页 |
| ·Functional Distribution of Code-switching in Online Chat Rooms | 第69-70页 |
| ·Discussion | 第70-77页 |
| CHAPTER SIX Conclusion | 第77-80页 |
| ·Major Findings | 第77-78页 |
| ·Concluding Remark | 第78-79页 |
| ·Limitations | 第79-80页 |
| REFERENCES | 第80-84页 |
| APPENDIX | 第84-92页 |
| Data sample 197 | 第84-86页 |
| Data sample 620 | 第86-88页 |
| Data sample 813 | 第88-90页 |
| Data sample 823 | 第90-92页 |
