怎么在函数中清空数组并返回给全局数组
var sum =new Array();
var i = 0;
function conut(cc,vv) {
var num = 4.788 * cc * vv / 40
var axt = Math.round(num*10000)/100;
if(isNaN(axt)){
alert("这不是个数")
}else {
i++;
sum[i-1]=axt;
}
$("#ss").val(num);
$("#yy").val(axt)
var sp = document.getElementsByClassName("sj");
if (sum.length<=5){
for (var j=0;j<sum.length;j++){
sp[j].innerHTML=sum[j];
}
}else {
//sum.splice(0,sum.length);
sum = [];
alert(sum.length)
for(var k=0;k<=sp.length;k++){
sp[k].innerHTML="";
}
}
return sum
}
清空数组后,怎么把空的数组返回给全局数组??