如何扫描<span>页面的</span>所有<span>标签并获取或设置内容？</span>

Question

I have this following code that scans all <input> tags of a page and then you are able to set you to get a value to this tag.

 var input = document.getElementsByTagName('input'); for (var i = 0; i < input.length; i++) { input[i].value = "123"; } 

Now, how can I do the same with a <span> tag, which I already know does not have a property called value ?

Answer 1

Just use following:

 var spans = document.getElementsByTagName('span'); for (var i = 0; i < spans.length; i++) { var text = spans[i].innerHTML; if (text.length == 0) { spans[i].innerHTML = i; //Some text } } 

Answer 2

You can use Node.textContent to set the text inside span :

 var input = document.getElementsByTagName('span'); for (var i = 0; i < input.length; i++) { input[i].textContent = "123"; } 

 <span></span> <span></span> <span></span> <span></span> <span></span> 

Answer 3

Your question was somewhat confusing, but I'll give my best answer:

Just take your code for the inputs, and change a few key componenents:

var span = document.getElementsByTagName('span');//Replace "input" with "span"

for (var i = 0; i < span.length; i++) {//Again, replacing "input" with "span"

  var textInsideTheSpan = span[i].textContent;//Reading text inside span
  span[i].textContent = "Your text here";//Writing text to the span

}

The key here is in the .textContent , a property of the javascript Node object, which can be read or written to, depending on your application. Everything else simply replaced "input" with "span".