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// 1:我们需要一个临时变量temp
// 2:把apple1给我们的变量temp
// 3:把apple2里面的苹果给apple2
// 4：把临时变量里面的值给apple2
var temp;
var apple1 = '青苹果'
var apple2 = '红苹果'
temp = apple1;
apple1 = apple2;
apple2 = temp;
console.log(apple1);
console.log(apple2);
</script>
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