This time I will show you how to store key values in js, and what are the precautions for storing key values in js. 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 astring. 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>
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