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Introduction to storage key-value pairs and precautions based on js_javascript skills

不言Original: 2018-03-31 14:55:041560browse

The following editor will introduce to you the key-value pairs stored in js and the precautions. I hope to be helpful. Let’s follow the editor and 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 state again that the key needs to be a string.

Key contents

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8"> 
<title>菜鸟教程(runoob.com)</title> 
<script src="http://cdn.static.runoob.com/libs/jquery/1.10.2/jquery.min.js">
</script>
<script>
var map={
 key1:&#39;abc&#39;,
 key2:&#39;def&#39;
};
$(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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