JavaScript创建数组的方法详解

var arr = new Array();//创建了一个空数组

//1.利用数组字面量（是方括号)创建数组
var arr = [];//创建了一个空数组
var arr1 = [1,2,'student',true];//数组里面可以存放任何类型的数据，必须以逗号分割

console.log(arr[2]);

var arr = ['red','green','blue'];
for(var i = 0;i < 3;i++){
    console.log(arr[i]);
}
//打印数组长度
console.log(arr.length);
//动态检测数组长度
for(var i = 0;i < arr.length;i++){
    console.log(arr[i]);
    }

//经典案例打印数组最大值
var arr = [2,6,1,77,52,25,7,99];
var max = arr[0];
for(var i = 0;i < arr.length;i++){
    if(max < arr[i]){
        max = arr[i];
        }
    }
    conaole.log('该数组里面的最大值是' + max);

var arr = ['red','green','blue','pink'];
var str ='';
for(var i = 0;i < arr.length;i++){
	str+=arr[i]+'|';//也可以var sep = '!';str+=arr[i]+sep;
}
console.log(str);

var arr = ['red','green','blue','pink'];
var str ='';
for(var i = 0;i < arr.length;i++){
	str+=arr[i]+'|';//也可以var sep = '!';str+=arr[i]+sep;
}
console.log(str);

var arr = [1,2,3,4,5,6,7,8,9,10];
var newArr = [];
console.log(newArr);
for(var i = 0;i < arr.length;i++){
	if(arr[i]>=5)
	{
		newArr[newArr.length] = arr[i];
	}
}

//将7删除
var arr = [1,2,3,4,5,6,7,8,9,10];
var newArr = [];
console.log(newArr);
for(var i = 0;i < arr.length;i++){
	if(arr[i] ！= 7)
	{
		newArr[newArr.length] = arr[i];
	}
}
console.log(newArr);