变量是用于存储信息的"容器"。实例varx=5;vary=6;varz=x+y;尝试一下»就像代数那样x=5y=6z=x+y在代数中，我们使用字母（比如x）来保存值（比如5）。通过上面的表达式z=x+y，我们能够计算出z的值为11。在JavaScript中，这些字母被称为变量。您可以把变量看做存储数

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JavaScript拥有动态类型JavaScript拥有动态类型。这意味着相同的变量可用作不同的类型：实例varx;              //x为undefinedvarx=5;          //现在x为数字varx="John";     //现在x为字符串变量的数据类型可以使用 

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JavaScript Array（数组） 对象数组对象的作用是：使用单独的变量名来存储一系列的值。在线实例创建数组,为其赋值：实例varmycars=newArray();mycars[0]="Saab

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Whichcarmodelscanworkwith VOCOMII*SupportedVehiclesModels:VolvoTrucks–Olderelectricalsystem,Vehicleelectricalsystem’98;VERSION2,VERSION

AnarrayofstringsString[]cars={"Volvo","BMW","Ford","Mazda"};Anarrayofintegersint[]myNum={10,20,30,40};ChangeanArrayElementString

count()返回数组中的元素的个数<?php$cars=array("Volvo","BMW","Toyota");echocount($cars);?>3