这个js的函数该怎么写呢

Question

加上
owriter.value = owriter.value.substring(0, owriter.value.length - 1);

Answer 1

简单点可以把 "," 写到str里嘛.

Answer 2

加上下面这句会把里面的逗号都去掉了。还是不对
owriter.value = owriter.value.substring(0, owriter.value.length - 1);

Answer 3

owriter.value = owriter.value.replace(/(^\,)|(\,$)/g,'');

Answer 4

function PutWriter(str){
var owriter = $Obj('writer');
if(owriter) owriter.value += owriter.value==""?str: "," + str;
}

Answer 5

如果是空的话肯定是就是第一次+str
否则就 "," +str