题目

在一组数组中插入一个数(数不能重复)

        var attr = [1,3,9,4,5];

 

for(var i=0;i<attr.length;i++) { if(attr[i]==reng) { break; }

if(i==attr.length-1) { attr[i+1] = reng; } } alert(attr)

for(var i=0;i<attr.length;i++) { if(attr[i]==reng) { break; }

if(i==attr.length-1) { attr[i+1] = reng; } } alert(attr);*/

求数组中的某几个数出现的次数(2,3,5)

var attr = [1,2,3,1,2,3,4,5,3,2,5];

var a = 0;

var b = 0;

var c = 0;

var a1 = 2;

var b1 = 3;

var c1 = 5;

for(var i=0;i<attr.length;i++)

{ if(attr[i]==a1) { a++; }

if(attr[i]==b1) { b++; }

if(attr[i]==c1) { c++; } }

alert(a+","+b+","+c);