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How to store key values ​​in js in the project

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Release： 2018-06-12 11:50:49
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This time I will show you how to use js to store key values ​​in a project, and what are the precautions for using js to store key values ​​in a project. The following is a practical case, let's take a look.

The front end sometimes needs to store key-value pairs. The main point is that the key must be a string. It is important to note again that the key needs to be a string.

Key content

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8"> 
<title></title> 
<script src="http://cdn.static.runoob.com/libs/jquery/1.10.2/jquery.min.js">
</script>
<script>
var map={
 key1:'abc',
 key2:'def'
};
$(document).ready(function(){
 $("button").click(function(){
  map.key3=333;//js 里的键必须为字符串
  for(var key in map){//可以迭代键
   alert(map[key])//依据键取值
  }
  alert("add value:"+map.key3);
 });
});
</script>
</head>
<body>
 <button>click</button>
</body>
</html>
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js存储键值对
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