报错提示TypeError: this.searchData.unshift is not a function. (In 'this.searchData.unshift(this.keyword)', 'this.searchData.unshift' is undefined)
当使用unshift函数时,所获取得key值已有值,就会出现该错误.key值须为数组形式,储存数据
uniapp报错（unshift is not a function）
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