This right here is no bueno:(这里的权利不是布宜诺斯艾利斯：)
<script>
function test( ){
alert("Hiya buddy!");
}
document.getElementById().innerHTML = test();
</script>
document.getElementById() requires you pass it the ID of an element.(document.getElementById()要求您向其传递元素的ID。) So, for example, if there's a div on the page with the ID of #alert , you'd do document.getElementById('alert') .(因此，例如，如果页面上有一个ID为#alert的div ， #alert执行document.getElementById('alert') 。)
You also can't assign a function to the inner HTML of an element.(您也不能将函数分配给元素的内部HTML。) You need to create a script element and then append it to the document or another element.(您需要创建一个script元素，然后将其附加到文档或其他元素。) Instead, try:(相反，请尝试：)
<script>
let myTest = document.createElement('script')
myTest.text = `
function test() {
alert('Hiya buddy!')
};
test();
`
const body = document.querySelector('body')
body.appendChild(myTest)
</script>
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