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2. javascript ÖеıäÁ¿ÊÇÈõÀàÐ͵쬶¨Òå±äÁ¿Ê±Ö»Óà var ÔËËã·û¡£
var test1 = "hi";
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var test1 = "hi",test2 = "hello";
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var test1 = "hi",test2 = 12;
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var test1;
3. javascript ÿÌõÓï¾äµÄ½áβ“£»”¿ÉÓпÉÎÞ¡£
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var test1 = "hello";
test = test1 + " world";
alert(test); //outputs "hello world" 
8. javascript ÌṩÁË typeof ÔËËã·ûÀ´ÅжϱäÁ¿ÀàÐÍ¡£(typeof ¿É¶ÔδÉùÃ÷µÄ±äÁ¿×öÔËËã)
var test = "hello";
alert(typeof test); //outputs "string"
alert(typeof 12); //outputs "number" 
9. null ±íʾÉÐδ´æÔڵĶÔÏó¡£
alert(typeof (null)); //outputs "object" 
10. NaN ±íʾ·ÇÊý£¬Ëü²¢²»µÈÓÚ×ÔÉí¡£
alert(NaN == NaN); //outputs "false" 
alert(isNaN(test)); //outputs "true"
alert(isNaN(12)); //outputs "false" 


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