var now = ...;//your first p.fatherElement
while(now.nextSibling) { // 如果要取前一个用.previousSibling
var next = now.nextSibling;
if(next.getAttribute('class') != 'childElement') { // or something else
break;
}
console.log(next); // do what you want
now = next;
}
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原生：
原生javascript大概是这样