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关于使用map,for等遍历数组获取其中每一项的值在调用接口只取到最后一个值的问题
阅读量:695 次
发布时间:2019-03-15

本文共 1139 字,大约阅读时间需要 3 分钟。

接上一篇文章;

这里循环一个数组list,拿到其中的某些值,去做参数执行下一步的方法,需要这个参数(params)是变化的,但是在sendRightsParams方法中,输出的值总是数组的最后一项里面的内容,

getRights(list) {               const paramsKey = this.mediaForRights[this.type].keys.value;            if (list && list.length) {                   list.map((item, index) => {                       const params = item.name;                    const temp = item[this.mediaForRights[this.type].keys.id];                    this.$set(params, paramsKey, temp);                    this.sendRightsParams(params, index);                });            }        },

造成的原因:

这里给paramsKey赋值的话,每次重新的遍历会覆盖掉之前的值;
修改之后的代码

getRights(list) {               const paramsKey = this.mediaForRights[this.type].keys.value;            if (list && list.length) {                   list.map((item, index) => {                       const params = Object.assign({   }, item.name);                    const temp = item[this.mediaForRights[this.type].keys.id];                    this.$set(params, paramsKey, temp);                    this.sendRightsParams(params, index);                });            }        },

另外:如果采用var来定义变量的话可能会经常遇到变量的作用域、变量提升问题;一般使用let比较好。

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