javascript map的使用方法 

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>demo</title>
</head>
<body>
<div id="app">

</div>
</body>
<script>
 var map = new Map();
 var myKey = {name: 'darren'};
 map.set(myKey, 'my favorite book');
 map.set('my', 'linqitai');

 //是否包含某键
 console.log(map.has(myKey));

 //根据键获取值
 console.log(map.get(myKey));
 console.log(map.get('my'));
 console.log('======');

 //遍历值
 for(var item of map.values()){
        console.log(item);
 }
</script>
</html><!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>demo</title>
</head>
<body>
<div id="app">

</div>
</body>
<script>
 var courses = ['hello','world'];

 console.log(courses.map(function(course){
        return course.toUpperCase();
 }))
    console.log(courses);

</script>
</html>

posted on 2017-08-22 14:23  林祺泰  阅读(104)  评论(0)    收藏  举报

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