<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>obj遍历</title>
</head>
<body>
<script>
var obj = {"a":1, "b":2, "c":3};
for(let key in obj){
console.log("key:", key);
}
// key: a
// key: b
// key: c
</script>
</body>
</html><!doctype html>
<html lang="en">
<head>
阅读背景：
js obj遍历.html
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