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var arr = ["元素0", "元素1"];
var index = Math.floor(Math.random() * arr.length + 1) - 1;
console.log('随机数组元素'+arr[index]);
var arr = ["元素0", "元素1"];
var index = Math.floor(Math.random() * arr.length + 1) - 1;
console.log('随机数组元素'+arr[index]);