变量(JS)
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<meta charset="UTF-8">
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<title>变量</title>
<script>//1.声明变量 age 变量
var age;
age = 21;
//2.赋值 把值存入这个变量中
// 3.输出结果
console.log(age);
//4.变量的初始化
var myname = 'xx';
console.log(myname);</script>
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