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UntitledDocument//把內(nèi)容打印到頁(yè)面上//document.write('hellojs!');//彈出警告框//alert('hellojs!');//在控制臺(tái)打印輸出內(nèi)容//console.info('helloworld');3、html4/strict.dtd">
UntitledDocument5、avascriptcharset=utf-8>alert('我是內(nèi)部代碼!!!!');
UntitledDocument</titl</p><p>6、e><scripttype=text/javascriptcharset=utf-8>//關(guān)于全局變量和局部變量的簡(jiǎn)單說(shuō)明/*vara=3;//number全局變量//變量一共有兩種：全局變量局部變量functiontest(){//varb=2;//局部變量c=5;//全局變量alert(a);}test();alert(c);//alert(b);*/.//javascript是弱類型變量的腳本語(yǔ)言,根據(jù)賦值決定變量的類型//Number類型整數(shù)和小數(shù)vara1=10;vara2=10.5;vara3=NaN;//notanum</p><p>7、bervara4=1/0;//正無(wú)窮vara5=070;//8進(jìn)制和16進(jìn)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");//不是一個(gè)數(shù)//alert(a8);vara9=parseInt("12bbcc");//alert(a9);//undefined數(shù)據(jù)類型他的值只有一個(gè)：undefined表示變量聲明了,但是沒有</p><p>8、被賦值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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