javascript运行时错误保存/恢复

Question

我已经创建了这段代码，它的make用于在按restore时将表存储在变量中，然后返回到该状态，但在最后一段代码(该表的Id为sudoku)上似乎遇到了一个运行时错误，它在firefox中工作，但在IE中不工作，谢谢

var clone
function save()
{
    var table = document.getElementById("sudoku")
    clone = table.innerHTML
}

function restore()
{
    document.getElementById("sudoku").innerHTML=clone
}

编辑：错误消息：

Webpage error details User Agent: Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.1; WOW64; Trident/4.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; CPNTDF; .NET4.0E; .NET4.0C; BOIE9;ENUS) Timestamp: Mon, 15 Oct 2012 16:57:44 UTC Message: Unknown runtime error Line: 50 Char: 128 Code: 0 URI: file:///F:/uni%20work/home/Second%20year/CO525/assessments/Assessment2/assessmen‌​t2/javascript.js Message: Unknown runtime error Line: 50 Char: 128 Code: 0 URI: file:///F:/uni%20work/home/Second%20year/CO525/assessments/Assessment2/assessmen‌​t2/javascript.js

编辑完整代码：

    var current_cell = null; // the currently selected cell
    var saved = {};     // Object for saving the current game
    function initialize() {
var col, row;
// Work through all the cells in the table and set
// onclick event handlers and classNames for the empty
// ones.
for (row = 0; row <=8; row++) {
    for (col=0; col <= 8; col++) {
        var cell = document.getElementById('cell_' + col + '_' + row);
        if (!parseInt(cell.innerHTML)) {
            // cell is empty
            cell.onclick = selectCell;
            cell.className = 'tofill';
        }
    }
}
document.onkeypress = keyPress;
save();
    }
    var current_cell = null; // the currently selected cell
    var saved = {};     // Object for saving the current game
    function initialize() {
var col, row;
// Work through all the cells in the table and set
// onclick event handlers and classNames for the empty
// ones.
for (row = 0; row <=8; row++) {
    for (col=0; col <= 8; col++) {
        var cell = document.getElementById('cell_' + col + '_' + row);
        if (!parseInt(cell.innerHTML)) {
            // cell is empty
            cell.onclick = selectCell;
            cell.className = 'tofill';
        }
    }
}
document.onkeypress = keyPress;
save();
    }

    // mouse button event handler
    function selectCell() {
if (current_cell !== null) {
    current_cell.className = 'tofill';
}
current_cell = this;
current_cell.className = 'selected';
    }

    // Capture keyboard key presses. If the key pressed is a digit
    // then add it to the current cell. If it is a space then empty
    // the current cell.
    function keyPress(evt) {
if (current_cell == null)
    return;
var key;
if (evt)
    // firefox or chrome
    key = String.fromCharCode(evt.charCode);
else
    // IE
    key = String.fromCharCode(event.keyCode);
if (key == ' ')
    current_cell.innerHTML = '';
else if (key >= '1' && key <= '9')
    current_cell.innerHTML = key;
    }

    var clone
    function save()
    {
    var table = document.getElementById("sudoku");
    clone = table.innerHTML;
    }

   function restore()
    {
    document.getElementById("sudoku").innerHTML=clone;
   }

Answer 1

可以使用DOM内置的javascript方法cloneNode克隆节点。

例如：

 var clone;
    function save()
    {
        var table = document.getElementById("sudoku");
        clone = table.cloneNode(true);
    }

    function restore()
    {
        document.getElementById("sudoku").parentNode.appendChild(clone);
    }

参考：https://developer.mozilla.org/en-US/docs/DOM/Node.cloneNode

Answer 2

我猜想#sudoku是一个<table>元素，不是吗？表元素上的。

相反，使用适当的DOM方法，或者不尝试存储HTML字符串，而是将sudoku的内容存储在二维数组中。

Answer 3

这是IE和使用innerHTML属性插入新HTML的一个长期问题。

(哎呀，谁会猜到，IE出了问题！！)

如果你愿意去jQuery，那么你可以用.

$("#mytable").html(myHtml);

否则，如果您可以将html放置到innerHTML标记的<div>属性中，它就会工作。

另一种选择是使用document.createElement("TR");编码风格自己创建单个对象。