正則表達(dá)式：匹配內(nèi)容為空的Html元素、求指教

$str = preg_replace('/\s+/', '', $str);

用dom方法也行呀

console.log(document.querySelectorAll('p').length)
var p = document.createElement('p')
p.innerHTML = '\n&nbsp\n\n&nbsp&nbsp&nbsp'
document.body.append(p)
console.log(p)
console.log(document.querySelectorAll('p').length)
document.querySelectorAll('p').forEach(function(ele){
    if(!ele.innerHTML.trim()){
        ele.parentElement.removeChild(ele)
    }
})
console.log(document.querySelectorAll('p').length)