// 测试: if (!js || js.innerText !== 'JavaScript') { alert('选择JavaScript失败!'); } else if (!arr || arr.length !== 3 || !arr[0] || !arr[1] || !arr[2] || arr[0].innerText !== 'Python' || arr[1].innerText !== 'Ruby' || arr[2].innerText !== 'Swift') { console.log('选择Python,Ruby,Swift失败!'); } else if (!haskell || haskell.innerText !== 'Haskell') { console.log('选择Haskell失败!'); } else { console.log('测试通过!'); }
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逍遙