javascript - 保存和比较表格单元格值

Question

我正在创建一个简单的记忆匹配游戏，我想比较每个单击的单元格的文本值以查看是否匹配。底部的单击事件处理程序是我尝试这样做，但我不确定如何保存单击了哪个单元格。如何保存每个单元格的文本值并比较它们，同时保存我正在比较的单元格，以便在单击的两个单元格不相等时隐藏它？text-indent 设置为 100%，默认隐藏溢出。

var createTable = function (col, row) {
    $('table').empty();
    for (var i = 1; i <= row; i++) {
        $('table').append($('<tr>'));
    }
    for (var j = 1; j <= col; j++) {
        $('tr').append($('<td>'));
    }
    countCells = row * col;
};
createTable(4, 1);

var arr = [1, 2, 1, 2];
var pushNum = function () {
    var len = arr.length;
    for (var i = 0; i <= len; i++) {
        var ran = Math.ceil(Math.random() * arr.length) - 1;
        $('td').eq(i).append(arr[ran]);
        arr.splice(ran, 1);
    }
};
pushNum();

var match1;
$('td').click(function () {
    $(this).css('text-indent', 0);
    match1 = $(this).eq();
    if (match1.val() === "1") {
        alert("GOOD");
    }
});

Answer 1

就个人而言，我认为我会创建几个函数来处理两件事：

1)onclick每个单元格上的一个函数，当单击一个单元格时，它会简单地切换某种“点击”类（使用toggleClass()）。它也可以有一个视觉指示器（例如，改变文本或背景颜色或类似的东西）。

2) 在切换完成后，将由#1 中的“onclick”调用的独立函数，以检查是否恰好单击了 2 个单元格。您可以使用 jQuery 选择器获取所有具有“单击”类的单元格，如果返回集的长度等于 2，则使用first()andlast()函数获取单击单元格的值，以便您可以比较它们。这是您将从上面集成现有的“它们是否匹配”JS 代码的功能。

这样，您实际上就不必存储该值，除非您知道自己做了两个选择然后实时检查它们，否则您永远不会检查。

Answer 2

发现它很有趣，所以我尝试用简单的 jQuery 来实现它

jQuery记忆游戏

var $mainTable = $('#mainTable'),
    myWords = [],
    valA, valB, col=4, row=3, start;

//    function to create the table
var createTable = function (col, row) {
    var $table = $('<table>'), i;

    // construct our table internally
    for(var i=0; i<row; i++){
        var $tr = $('<tr data-row="'+i+'">'); // make row

        for(var j=0; j<col; j++){
            $tr.append($('<td data-col="'+j+'">')); // make cell
        }
        $table.append($tr);
    }

    $mainTable.html($table.html());
};

//    generate an array random words from a dictionary
var giveWords = function(pairsRequested){
    var dictionary = ['now','this','is','only','a','test','I','think'],
        ar = dictionary.slice(0,pairsRequested);

    ar = ar.concat(ar);
    // taken from @ http://jsfromhell.com/array/shuffle [v1.0]
    for(var j, x, i = ar.length; i; j = parseInt(Math.random() * i), x = ar[--i], ar[i] = ar[j], ar[j] = x);
    return ar;
}

// initialize
createTable(col,row);
myWords = giveWords(6); // our words array

// listen
$mainTable.on('click', 'td' ,function(){
    var $that = $(this),
        thisCol = $that.data('col'),
        thisRow = $that.closest('tr').data('row');

    if(!valB && !$that.hasClass('clicked')){
        var itemNum = (thisRow*(col))+thisCol;

        if(!valA){   // first item clicked
            valA = myWords[itemNum];
            $that.addClass('clicked')
                 .text(valA);

        } else {    // we already have a clicked one
            valB = myWords[itemNum];

            if(valA === valB){ // if they match...
                $mainTable.find('.clicked')
                          .add($that)
                          .removeClass('clicked')
                          .addClass('revealed')
                          .text(valA);

                //    check how many open remaining
                var open = $mainTable.find('td')
                                     .not('.revealed')
                                     .length;

                if(open===0){    //    if 0, game over!
                    var elapsed = Date.now()-start;
                    alert('Congratulations! cleared the table in '+elapsed/1000+' seconds.');
                }

                valA = valB = undefined;
            } else {
                $that.addClass('clicked')
                     .text(valB);

                setTimeout(function(){ // leave the value visible for a while
                    $mainTable.find('.clicked')
                              .removeClass('clicked')
                              .text('');
                    valA = valB = undefined;
                },700);
            }
        }
    }

    if(!start){     // keep time of game completion
        start=Date.now(); 
    }
});

Answer 3

使用data-num表格单元格值的属性而不是使用类。有一些问题需要修复，比如双击同一个单元格或单击已经显示的单元格，但总而言之，现在它可以工作了！

var countCells;

var createTable = function (col, row) {
    var str = '';
    for (var i = 1; i <= row; i++) {
        str += '<tr>';
        for (var j = 1; j <= col; j++) {
            str += '<td>';
        }
        str += '</tr>';
    }
    $('table').html(str);
    countCells = row * col;
};
createTable(6, 3);

function shuffle(o) {
    for (var j, x, i = o.length; i; j = parseInt(Math.random() * i, 10), x = o[--i], o[i] = o[j], o[j] = x);
    return o;
}
// http://stackoverflow.com/questions/6274339/how-can-i-shuffle-an-array-in-javascript

var arr = [];
for (var i = 0; i < countCells / 2; i++) {
    arr[i] = arr[i + countCells / 2] = i + 1;
}
shuffle(arr);
//console.log(arr);

var tds = $('table td');
tds.each(function (i) {
    this.setAttribute('data-num', arr[i]);
});

var attempts = 0;
var match1 = null;
var info = $('#info');
var wait = false;
$('td').click(function () {
    if (wait) {
        return;
    } // wait until setTimeout executes
    var num = this.getAttribute('data-num');
    if (match1 === null && num != 'X') { //1st click on unmatched cell
        match1 = this;
        this.innerHTML = num;
        attempts++;
        info.text('Attempts: ' + attempts);
        return;
    } else { //2nd click
        var num1 = match1.getAttribute('data-num'); //1st num
        if (match1 === this) {
            // clicked twice this cell
            return;
        } else if (num == 'X') {
            // clicked on already revealed cell
            return;
        } else if (num == num1) {
            // both cells match
            info.text('Bingo! Attempts: ' + attempts);
            this.innerHTML = match1.innerHTML = num1;
            this.setAttribute('data-num', 'X');
            match1.setAttribute('data-num', 'X');
            match1 = null;
        } else {
            // cells not match
            info.text('Try again. Attempts: ' + attempts);
            this.innerHTML = num;
            var self = this;
            wait = true;
            window.setTimeout(function () {
                self.innerHTML = match1.innerHTML = '';
                match1 = null;
                wait = false;
            }, 1000);
        }
    }
});

jsfiddle

请享用！:-)