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<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
</head>
<body>
<script>
//array类型
/*var color = new Array();
var colors = new Array(20);//创建一个长度20的数组
var colorss = new Array("red","blue","green");
//var colors=["red","blue","green"];
console.log(colorss);
console.log(colorss[0]);
colorss[2]="black";//修改
colorss[3]="gray";
console.log(colorss);*/
var colorss = new Array("red","blue","green");
colorss.length=5;
//alert(colorss[4]);//设置长度----undefined
var colo=["red","blue"];
colo[colo.length]="green";
colo[colo.length]="black";//可以添加
console.log(colo);
//检测数组方式
value=[];
if(value instanceof Array){
alert('yes');
}
if(Array.isArray(value)){
}
</script>
</body>
</html>
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