JavaScript中有什么办法可以在段落标签的值更改时调用函数.
概述:
HTML:
<p id="timer">00:00</p> <button onclick="change()">My Button</button>
JS:
function change() { document.getElementById("timer").innerHTML = "00:01"; } function hello() { alert("Hello"); }
当段落的值更改时,我想提醒(“Hello”).
像一个连续的功能,检查段落的值的变化.
解决方法
您可以使用MutationObserver将characterData选项设置为true
<script> function change() { document.getElementById("timer").innerHTML = "00:01"; } function hello() { alert("Hello"); } window.onload = function() { var target = document.querySelector("p"); var observer = new MutationObserver(function(mutations) { mutations.forEach(function(mutation) { hello() }); }); var config = { childList: true,subtree: true,characterData: true }; observer.observe(target,config); } </script> <p id="timer">00:00</p> <button onclick="change()">My Button</button>