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| 添加到这里之前
<button onclick="myFunction()">xxx</button>
<script>
function myFunction() {
let htm = `<span style="color: #ff6b81">在body标签后面插入内容</span>`;
let tempNode = document.createElement('div');
tempNode.id = 'insert-body'
tempNode.className = 'insert-body'
tempNode.innerHTML = htm
tempNode.style.display = 'flex'
tempNode.style.justifyContent = 'center'
let bodyDom = document.body;
let theFirstChild = bodyDom.firstChild
document.body.insertBefore(tempNode, theFirstChild)
if (document.getElementById('insert-body')) {
console.log('添加成功');
}else{
console.log('添加失败');
}
}
</script>
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