if文の指定方法 = ではなく、==で動く
動かない
let a=window.prompt('好きな野菜を選択してください\rきゅうりなら【１】 / トマトなら【２】','');
if(a = 1){a='きゅうり'}else{a='トマト'};
動く
let a=window.prompt('好きな野菜\rきゅうりなら【１】 / トマトなら【２】','');
if(a == 1){a='きゅうり'}else{a='トマト'};
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