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console.log(myChildren(box));
function myChildren(ele,tagName){
var ary = [], elements = ele.childNodes;
if(/MSIE (6|7|8)/i.test(navigator.userAgent)) {
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if (typeof tagName === 'string') {
for(var j=0;j<ary.length;j++){
var tagEle = ary[j];
if (tagEle.nodeName.toLowerCase() !== tagName.toLowerCase()) {
ary.splice(j,1);
j--;
}
}
}
return ary;
}
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