简单漂亮的计算器

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equ.onclick = function(){  //等号 加判断点是否多点
		if(result.getAttribute("c") != ""){
			re = eval((result.getAttribute("a")) + (result.getAttribute("b")) + (result.getAttribute("c")));
			if(re == "Infinity"){
				re = 0;
			}
			result.innerHTML = re;
			reset_button();
		}
	}

//AC键
reset.onclick = function(){ 
		reset_button();
		result.innerHTML = "0";
	}

del.onclick = function(){  //删除键
		var c = result.getAttribute("c");
		var a = result.getAttribute("a");
		if(c != ""){
			if(c.length < 2){
				result.setAttribute("c","");
				result.innerHTML = a;
			}else{
				result.setAttribute("c",c.substr(0,c.length - 1));
				result.innerHTML = c.substr(0,c.length-1);
			}
		}else{
			result.setAttribute("b","");
			if(a.length < 2){
				result.setAttribute("a","");
				result.innerHTML = "0";
			}else{
				result.setAttribute("a",a.substr(0,a.length -1));
				result.innerHTML = a.substr(0,a.length-1);
			}
		}
	}