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UntitledDocument//把内容打印到页面上//document.write('hellojs!');//弹出警告框//alert('hellojs!');//在控制台打印输出内容//console.info('helloworld');3、html4/strict.dtd">
UntitledDocument5、avascriptcharset=utf-8>alert('我是内部代码!!!!');
UntitledDocument</titl</p><p>6、e><scripttype=text/javascriptcharset=utf-8>//关于全局变量和局部变量的简单说明/*vara=3;//number全局变量//变量一共有两种：全局变量局部变量functiontest(){//varb=2;//局部变量c=5;//全局变量alert(a);}test();alert(c);//alert(b);*/.//javascript是弱类型变量的脚本语言,根据赋值决定变量的类型//Number类型整数和小数vara1=10;vara2=10.5;vara3=NaN;//notanum</p><p>7、bervara4=1/0;//正无穷vara5=070;//8进制和16进制(0xA)//alert(a4);//alert(a5);/*vara6=0.1;vara7=0.2;if(a6+a7==03){alert('等于0.3');}else{alert('不等于0.3');}*/vara8=parseInt("aaabbcc");//不是一个数//alert(a8);vara9=parseInt("12bbcc");//alert(a9);//undefined数据类型他的值只有一个：undefined表示变量声明了,但是没有</p><p>8、被赋值varb1;//alert(b1);//Null空值varb2=null;//alert(b2);//Stringvarstr1="我是字符串1";varstr2='我是字符串2';//Booleanvarflag1=false</p> </div>
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