Javascript Span.innerHTML 返回文本但 Span.value 返回未定义？
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Span.innerHTML returns text but Span.value returns undefined?
提问by Ryan
I have a function that populates a pages with something like this
我有一个函数可以用这样的东西填充页面
<span id="span_title_'+result_no+'">'+title+'</span>
and then I have another function that has this:
然后我有另一个功能：
document.getElementById("span_title_"+which_table).innerHTML="asg";
alert(document.getElementById("span_title_"+which_table).value);
The strange thing is the first (innerHTML) call works perfectly, the second one, the alert, gives me "undefined"
奇怪的是第一个（innerHTML）调用完美无缺，第二个，警报，给了我“ undefined”
Any idea why this is?
知道这是为什么吗？
回答by Ates Goral
<span>DOM elements don't have a valueproperty. Use innerHTMLto read the contents.
<span>DOM 元素没有value属性。使用innerHTML阅读内容。
回答by Senad Me?kin
span doesn't have attribute with the name "value" only innnerHTML, you should use innerHTML for second call.
span 没有名称为“value”的属性，只有innerHTML，您应该使用innerHTML 进行第二次调用。
