function contains(a, b){
//元素a是否包含元素b
if (document.compareDocumentPosition) {
return !!(a.compareDocumentPosition(b) & 16);
}
else {
return a !== b && (a.contains ? a.contains(b) : true);
}
}
参考:http://blog.csdn.net/huajian2008/article/details/3960343
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