点击按钮让文字来回变色<h1>hellow,word</h1> <button id="k">开始</button> <

<h1>hellow,word</h1>
<button id="k">开始</button>
<button id="t">停止</button>

<script src='https://cdn.bootcdn.net/ajax/libs/jquery/3.6.0/jquery.js'></script>
<script>

    let sz = 0
    $('#k').click(function () {
        cc = setInterval(han, 1000)
        function han() {
            sz++
            if (sz % 2 == 0) {
                $('h1').css('color', 'red')

            } else {
                $('h1').css('color', 'yellow')
            }
        }
    })
    $('#t').click(function () {
        clearInterval(cc)
    })