js for 循环 判断

Question

我有一个数组 ,还有一个输入的数值.如果数值不在数组里，那么数组就加上这个新数值，否则不做任何操作
代码大概如下
            var ArrayddlPercentage = ddlPercentage.value.split(",");
            for(var i = 0 ;i < ArrayddlPercentage.length - 1 ;   i++)
            {
                if(ArrayddlPercentage[i].toString() != ddl.id.toString())
                {
                    ddlPercentage.value += ddl.id   +   ",";
                }
            }
这个是有错的.望大家能够指点一下
谢谢

Answer 1

 ArrayList arry = new ArrayList();
                arry.Add(1);
                arry.Add(2);
                arry.Add(3);
                arry.Add(4);                object a = 5;
                if (!arry.Contains(a))
                {
                    arry.Add(a);
                }                foreach (object o in arry)
                {
                    Console.WriteLine(o);
                }

Answer 2

ddlPercentage是输入的字符串么，为什么要用逗号截取数组？

Answer 3

1楼的，他要的是 js 不是 cs

Answer 4

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

Answer 5

            var isExist=false;
            var ArrayddlPercentage = ddlPercentage.value.split(",");
            for(var i = 0 ;i < ArrayddlPercentage.length;  i++)
            {
                if(ArrayddlPercentage[i].toString() == ddl.id.toString())
                {
                    isExist=true;
                }
            } 
            if(!isExist)
            {
                 ddlPercentage.value += ddl.id  +  ","; 
                 //ddlPercentage.value += ","+ ddl.id ; 
                 // 你自己看看应该用哪个
            }

Answer 6

        var arr=Array('2','3');
        
        var str="adf243";
        for(var i=0;i<str.length;i++)
        {
            if(arr.indexOf(str[i])>-1)
            {
                //什么都不做
            }
            else
            {
                //添加
                arr.push(str[i]);
            }
        }

Answer 7

应该是
  for(var i = 0 ;i < ArrayddlPercentage.length ;  i++)

Answer 8

 var ArrayddlPercentage = ddlPercentage.value.split(","); 
 var bl=false;
            for(var i = 0 ;i < ArrayddlPercentage.length - 1 ;  i++) 
            { 
                //遍历ArrayddlPercentage中的值，如果存在和ddl.id相等的值，设置bl=true;
                if(ArrayddlPercentage[i].toString() == ddl.id.toString()) 
                { 
                    bl=true; 
                } 
            } 
//循环结束之后，如果bl的值为true,则在数组中进行添加ddl.id的值..
if(bl==true)
{
ddlPercentage.value += ddl.id  +  ",";
}