实现点击按钮切换
<body>
<button onclick="next()" id="k">开始</button>
<script>
var k = document.getElementById("k")
var arr = ["开始", "暂停"]
var count = 0;
function next() {
count++
if (count == 2) {
count = 0;
}
k.innerHTML = arr[count]
}
</script>
</body>
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