html状态变化实现,实现html进入编辑状态，在线编辑器中用到的（html的designMode）...

var editorDoc;

function InitEditable () {

var editorBody = document.body;

// turn off spellcheck

if ('spellcheck' in editorBody) { // Firefox

editorBody.spellcheck = false;

}

if ('contentEditable' in editorBody) {

// allow contentEditable

editorBody.contentEditable = true;

}

else { // Firefox earlier than version 3

if ('designMode' in editorDoc) {

// turn on designMode

editorDoc.designMode = "on";

}

}

}

function ToggleBold () {

editorDoc.execCommand ('bold', false, null);

}