Web基础系列三、JavaScript(页面行为)

int i=10;

int i="10";

var j=10; var j="10"; var j=true;

document.write

onclick="alert('Welcome!')"

innerHTML

document.getElementById("demo").style.color="#f00";

if isNaN(x) {alert("Not Numeric")};

<script type="text/script">js代码</script>

<script type="text/script" src="js文件路径"></script>

typeof(变量名称)

var i=10.01;

var flag=true;

var data=null;

var m;

var cars=new Array();

var person= new Object;

if

if ... else ...

if ... else if ...  else ...

switch ... (default)

for

for ... in

var person={fname:"John",lname:"Doe",age:25};

for (x in person)
{
txt=txt + person[x];
}

while ...

do ... while ...

break & continue

try ... catch & throw

function add1(a,b,c) { return a+b+c; }

var add = new Function(ars,method);

var add = function(a,b) { return a+b; }

new Array();

new Array(5);

new Array("a", true, ..., 7);

new Boolean(value);  // 构造函数

Boolean(value);      // 转换函数

var myDate=new Date();