javascript中的for in-loop
我试图理解下面的javascript代码片段javascript中的for in-loop,javascript,Javascript,我试图理解下面的javascript代码片段 <!DOCTYPE html> <html> <body> <p>Click the button to loop through the properties of an object named "person".</p> <button onclick="myFunction()">Try it</button> <p id="demo"></
<!DOCTYPE html>
<html>
<body>
<p>Click the button to loop through the properties of an object named "person".</p>
<button onclick="myFunction()">Try it</button>
<p id="demo"></p>
<script type="text/javascript">
function myFunction()
{
var x;
var txt="";
var person={fname:"John",lname:"Doe",age:25};
for (x in person)
{
txt=txt + person[x];
}
document.getElementById("demo").innerHTML=txt;
}
</script>
</body>
</html>
fname:"John",lname:"Doe",age:25
personfor intxt = txt + person[x];
persontxtJohnDoe25
仅供参考，始终使用
作为对象的in作为数组的人for（x个人）x键person[x]txt=txt+person[x]txt值hasOwnProperty我建议您阅读并在有任何问题时继续检查MDN。那里的文档非常好。什么是
person[x]x=“fname”person[x]=“John”“John”+“Doe”+“25”=“JohnDoe25”JohnDoe25