change readOnly blur 清空clear 设置颜色 red 设置bold 设置绿色 getContents getSelectionText insertImage insertImage online insertText redo removeFormat scrollIntoView setContents undo 以下是format细节功能 italic underline strike script sub script super header H1 header H2 header H3 header H4 header H5 header H6 align left align center align right align justify direction indent +1 indent -1 list ordered list bullet 设置颜色 red removeFormat