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作业

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var ul = $('#test-div>ul')
var li = $('#test-div>ul>li')
langList = ['Pascal', 'Lua', 'Ruby']
var textArray = $('#test-div>ul>li>span');
textArray.each(function(index, item) {
    var lang = $(item).text()
    langList.push(lang)
    })
    langList.sort()
    li.remove()
    for (i of langList) {
    ul.append(`<li><span> ${i} </span></li>`)
    }

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