<!DOCTYPE html>
<html lang="en">
<head><meta charset="UTF-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><title>交换两个变量的值</title>
</head>
<body><script>/* 1我们需要一个临时变量来做 把app1给我们的临时变量给temp2把app2的苹果给app13把临时变量的值给app2*//* 临时变量为空 */var temp;var app1='青苹果';var app2='红苹果';temp = app1;//把右边给左边app1 = app2;app2 = temp;console.log(app1);console.log(app2);</script>
</body>
</html>运行结果
