1. A method for previewing a web page, comprising: receiving a typeset main document from a middleware server, wherein the typeset main document is obtained by loading a main document of a web page link requested to be previewed in accordance with a web page previewing request after the middleware server receives the web page previewing request sent in accordance with a web page previewing triggering instruction, and by typesetting at least a part of the main document, and wherein loading the main document excludes loading an external CSS (Cascading Style Sheet) associated with the main document, and typesetting the main document includes writing an internal CSS into the main document; and capturing at least the part of the typeset main document and scaling the captured typeset main document in accordance with a screen size of a mobile terminal to generate a preview image for the mobile terminal to display.
4. The method of claim 1 , further comprising: typesetting a first preset region of the main document.