for循环里面赋值，出来就没了，怎么回事？

var wordlist=that.data.list;

    switch (options.writestyle) {

      case ‘0’:

        this.setData({

          str: options.str,

          write:‘csl’

        })

        break;

        case ‘1’:

          this.setData({

            str: options.str,

            write:‘wxz’

          })

          createlist(that,options,wordlist);//wordlist

          var slen=options.str.length;

          for(var i=0;i<slen;i++){

            wordlist[i].Urlstr=‘cloud://shufa-8rvqy.7368-shufa-8rvqy-1259130971/wxz/’+wordlist[i].word+’.jpg’

            console.log(wordlist[i].word)

            console.log(wordlist[i].Urlstr)

            console.log(wordlist)

          }

          console.log(‘case1’+wordlist)