找到没有属性的DOM元素？

Question

I'm trying to find all span tags that have no attributes -- no class, no styling, no nothing. I've been doing this:

function hasAttributes(span) {
    if (span.outerHTML.slice(0,6) === '<span>') return true;
    return false;
}

Is there a better (faster) way to check if a particular element qualifies?

Answer 1

You can use querySelectorAll() to select all spans and then use for loop to filter spans by attributes property. If span doesn't have any attributes it will return empty array.

 var spans = document.querySelectorAll('span'); for (var i = 0; i < spans.length; i++) { if (spans[i].attributes.length == 0) spans[i].style.color = 'blue'; } 

 <span>one</span> <span class="two">Two</span> 

Answer 2

Check attributes property of element for length

function hasAttributes(span){
    return span.attributes.length;
}