低于ie8建议自己封装一个indexOf查找的方法
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
</head>
<body>
<script type="text/javascript">
/*//创建一个保存颜色的数组
var colors=new Array(3);
colors[0]="#f00";
colors[1]="#0f0";
colors[2]="#00f";
console.log(colors);
var nums=new Array(1,3,6,9);
//console.log(nums);
var cols=["red","yellow","green"];
//console.log(cols);
var infos=[6,"marry",true,{email:"marry@sohu.com"}];
//console.log(infos);
console.log(cols[1]); //读取cols这个数组中索引为1的值*/
var arr=["a","b","c","d"];
// console.log(arr.length); //4
// arr.length=2;
// arr[99]="z";
// console.log(arr.length); // 100
//数组的遍历
for(var i=0;i<arr.length;i++){
console.log(arr[i]);
}
</script>
</body>
</html>
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
</head>
<body>
<script type="text/javascript">
//push
var colors=new Array("red","green");
var len=colors.push("blue","yellow","black");
console.log(len);
//unshift
var nums=[2,7,8,6];
var size=nums.unshift(99,66);
console.log(nums);
//pop
var n=nums.pop();
console.log(nums);
//shift
var m=colors.shift();
console.log(colors);
</script>
</body>
</html>
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
</head>
<body>
<script type="text/javascript">
//join
var nums=[2,4,5];
var str=nums.join(); //2,4,5
var words=["border","left","color"];
//border-left-color
var wordstr=words.join("-");
console.log(wordstr);
//reverse
nums.reverse();
console.log(nums);
var strs=["a","b","c","d"];
//返回dcba这个字符串
var newstr=strs.reverse().join("");
console.log(newstr);
//29,5,24,17,32
var arr=[9,23,15,-99,88,12,-2];
//降序
/*arr.sort(function(a,b){
return b-a
});*/
//升序
arr.sort(function(a,b){
return a-b
})
console.log(arr);
</script>
</body>
</html>
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
</head>
<body>
<script type="text/javascript">
var arr1=["a","b","c"],
arr2=["d","e",1,3],
arr3;
//concat
arr3=arr1.concat(arr2,["m",99,8]);
console.log(arr3);
//slice
var colors=["red","green","blue","yellow","orange"];
//var newColors=colors.slice(1,3);
// var newColors2=colors.slice(2,4);
var newColors3=colors.slice(-4,3);
console.log(newColors3);
//完成以下代码段，实现b数组对a数组的拷贝，方法越多越好
var a=[1,"yes",3],
b;
//1、数组遍历，push
/*b=new Array();
for(var i=0;i<a.length;i++){
b.push(a[i]);
}*/
//2、concat()
b=[].concat(a);
console.log(b);
//3、slice();
b=a.slice(0);
console.log(b);
</script>
</body>
</html>
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
</head>
<body>
<script type="text/javascript">
var arr=["a","b","c","d","e","f"];
//删除
//var delArr=arr.splice(2,0);
// console.log(arr);
// console.log(delArr);
//插入
//var insertArr=arr.splice(3,0,"m","n",88);
// console.log(arr);
// console.log(insertArr);
//替换
var replaceArr=arr.splice(1,2,"x","y","z");
console.log(arr);
console.log(replaceArr);
</script>
</body>
</html>
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
</head>
<body>
<script type="text/javascript">
var nums=[1,7,5,7,8,1,6,9];
//var pos=nums.indexOf(7,3);
// var pos=nums.lastIndexOf(1);
var pos=nums.lastIndexOf("7");
console.log(pos);
//封装一个方法实现indexOf的功能
function ArrayIndexOf(arr,value){
//检测value在arr中出现的位置
for(var i=0;i<arr.length;i++){
if(arr[i]===value){
return i;
}
}
return -1;
}
var pos2=ArrayIndexOf(nums,8);
console.log(pos2);
</script>
</body>
</html>