获取数组中最大最小值方法js代码(自写)

function getMaximin (arr,maximin) { 
if (maximin == "max") { 
return Math.max.apply(Math, arr); 
}else if (maximin == "min") { 
return Math.min.apply(Math, arr); 
} 
} 

var a = [3,2,4,2,10] 

var b = [12,4,45,786,9,78] 

alert("aMax:" + getMaximin(a,"max") + "---aMin:" + getMaximin(a,"min") + "---bMax:" + getMaximin(b,"max") + "---bMin:" + getMaximin(b,"min"))//aMax:10---aMin:2---bMax:786---bMin:4