所以...代码是这样的：
<script>
var total_cases = 0;
var new_cases = 0;
var total_deaths = 0;
fetch('https://covid.ourworldindata.org/data/owid-covid-data.json')
.then(res => {
return res.json()
})
.then (raw_data => {
for (const key in raw_data) {
const country = raw_data[key];
const country_data = country.data;
const latest_data = country_data[country_data.length - 1];
console.log(latest_data);
if (country.location != "World") {
if (latest_data.total_cases != null) {
total_cases += latest_data.total_cases;
}
if (latest_data.new_cases != null) {
new_cases += latest_data.new_cases;
}
if (latest_data.total_deaths != null) {
total_deaths += latest_data.total_deaths;
}
}
}
});
document.getElementById("total_cases").innerHTML = total_cases;
document.getElementById("new_cases").innerHTML = new_cases;
document.getElementById("total_deaths").innerHTML = total_deaths;
</script>
'total_cases' 和另一个变量应该大于 0，但是结果显示，例如：
<div id="total_cases"></div>
结果是0。请帮忙我不知道为什么它显示为0。