（不确定，以防万一）
局限性：使用CSSOM，样式表应来自同一来源。
function getElementChildrenAndStyles(selector) {
var html = $(selector).outerHTML();
selector = selector.split(",").map(function(subselector){
return subselector + "," + subselector + " *";
}).join(",");
elts = $(selector);
var rulesUsed = [];
// main part: walking through all declared style rules
// and checking, whether it is applied to some element
sheets = document.styleSheets;
for(var c = 0; c < sheets.length; c++) {
var rules = sheets[c].rules || sheets[c].cssRules;
for(var r = 0; r < rules.length; r++) {
var selectorText = rules[r].selectorText;
var matchedElts = $(selectorText);
for (var i = 0; i < elts.length; i++) {
if (matchedElts.index(elts[i]) != -1) {
rulesUsed.push(rules[r]); break;
}
}
}
}
var style = rulesUsed.map(function(cssRule){
if (cssRule.style) {
var cssText = cssRule.style.cssText.toLowerCase();
} else {
var cssText = cssRule.cssText;
}
// some beautifying of css
return cssText.replace(/(\{|;)\s+/g, "\$1\n ").replace(/\A\s+}/, "}");
// set indent for css here ^
}).join("\n");
return "<style>\n" + style + "\n</style>\n\n" + html;
}
用法：
getElementChildrenAndStyles("#divId");
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