判断内容

Question

本帖最后由 jy02409187 于 2012-05-16 15:09:43 编辑

Answer 1

function show()
    {
       var a = "文本,文本,文本";
       if(a.substring(a.length-1,a.length) != ",")
       {
            a = a+",";
       }
       alert(a);
    }

Answer 2

没看清还有前面要加“，”
function show()
    {
       var a = "文本,文本,文本";
       if(a.substring(a.length-1,a.length) != ",")
       {
            a = a+",";
       }
       if(a.substring(0,1) != ",")
       {
            a = ","+a;
       }
       alert(a);
    }