js+HTML+CSS实现计算器

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html+css

	
		
		
		
	
	
		
"all">
			
"top">
				"text" id="display">
			
			
"bottom">
				
"btn" οnclick="backOne()">
					<-
				
				
"btn" οnclick="clearAll()">
					C
				
				
"btn">
					+/-
				
				
"btn" value="+" οnclick="clickBtn('+')">
					+
				
				
				
				
"btn" value="9" οnclick="clickBtn(9)">
					9
				
				
"btn" value="8" οnclick="clickBtn(8)">
					8
				
				
"btn" value="7" οnclick="clickBtn(7)">
					7
				
				
"btn" value="-" οnclick="clickBtn('-')">
					-
				
				
				
				
"btn" value="6" οnclick="clickBtn(6)">
					6
				
				
"btn" value="5" οnclick="clickBtn(5)">
					5
				
				
"btn" value="4" οnclick="clickBtn(4)">
					4
				
				
"btn" value="*" οnclick="clickBtn('*')">
					x
				
				
				
				
"btn" value="3" οnclick="clickBtn(3)">
					3
				
				
"btn" value="2" οnclick="clickBtn(2)">
					2
				
				
"btn" value="1" οnclick="clickBtn(1)">
					1
				
				
"btn" value="/" οnclick="clickBtn('/')">
					÷
				
				
				
				
"btn" value="0" οnclick="clickBtn(0)">
					0
				
				
"btn" value="." οnclick="clickBtn('.')">
					.
				
				
"btn">
					H
				
				
"btn" οnclick="displayd()">
					=
				
			
		
 
	

js