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                ## 如何使用變量 * var 生命變量 ``` var age; ``` * 變量的賦值 ``` var age; age = 18; ``` * 同時聲明多個變量 ``` var age, name, sex; age = 18; name = '張三'; ``` 示例: ~~~ <script> //寫法一: //聲明變量 var name; //變量賦值 name = '王樂樂'; //輸出變量 console.log(name); //寫法二: //聲明變量 var num = '我是一個變量'; //輸出變量 console.log(num); //同時聲明多個變量 var s1 = 'hello', s2 = 'word', s3 = '你好'; //輸出變量 console.log(s1, s2, s3); </script> ~~~ 效果: ![](https://img.kancloud.cn/b1/02/b102cd60d337fe628bdbb6323ab1854a_597x186.png)
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