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没找到更好的解决办法，只能用字符串拼接的方式解决。

sum:function(){
		debugger
var n1 = "1234567890123.1000";				var n2 = "1234567890123.1000";				var precision = 4;				
var result = "";				if(n1.split('.').length>1 && n2.split('.').length>1){					var zs1 = n1.split('.')[0];					var xs1 = n1.split('.')[1];					var zs2 = n2.split('.')[0];					var xs2 = n2.split('.')[1];										var temSum1 = parseInt(zs1) + parseInt(zs2);					
var temSum2 = parseInt(xs1) + parseInt(xs2);					
temSum2 = ("#"+temSum2).slice(1);					if(temSum2.length > precision){						temSum1 += 1;						temSum2 = ("#"+temSum2).slice(2);						result = temSum1.toString()+'.'+temSum2;					}else{						
result = temSum1+'.'+ ("#"+temSum2).slice(1);					}				}				console.log(result);			}