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class KeyWordModel{
????key = 'q'
????maxLength = 10
????getHistory(){
????????const words = wx.getStorageSync(this.Key)
????????if(!words){
????????????return []
?????????}
????????return words
????}
????addToHistory(keyword){
????????let words = this.getHistory()
????????const has = words.include(keyword)
????????if(!has){
????????????const length = words.length
????????????if(length>=this.maxLength){
????????????????words.pop();
?????????????}
?????????????words.unshift(keyword)
????????????? wx.setStroageSync(this.key,words)
????????}
????}
}
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