HTML5-Based (hypertext markup language 5 based) large text reading positioning and displaying method

The invention relates to an HTML5-Based (hypertext markup language 5 based) large text reading positioning and displaying method, comprising: determining a reading mode of text according to a user-input first command; if the reading mode is a user-custom mode, receiving a second command input by the user, and setting multiple highlight display rule sets for text reading according to the second command; performing keyword highlight displaying and annotation indicating on content of a current page of the text according to the multiple highlight display rule sets; generating, through HTML5 and anarea location algorithm, a navigation map for keywords and annotations in the current page of the text; positioning, in the current page of the text, the keywords corresponding to a first color in the navigation map. The HTML5-based large text reading positioning and displaying method has the advantages that navigation and positioning functions can be provided for reading large texts, positioningand checking are facilita