如何遍历获取HTML里的Table内容？

    
        window.onload = function() {

            var arrayMain = [];
            var _tab = document.getElementById("Table1");
            var rowsLen, cellsLen;

            if (_tab != null) {
                rowsLen = _tab.rows.length;

                if (rowsLen > 0) {
                    cellsLen = _tab.rows[0].cells.length;
                    for (var m = 0; m < rowsLen; m++) {

                        var _arrayItem = [];
                        for (var n = 0; n < cellsLen; n++) {
                            _arrayItem.push(_tab.rows[m].cells[n].outerText);
                        }
                        arrayMain.push(_arrayItem);
                    }
                }
            }
        }
    

        function SelectRow(id)         {             var obj = event.srcElement;                          var _table = document.getElementById("m_table1");<>                          //变色前清空颜色             for(var i = 0;i<_table.rows.length;i++)
            {                 for(var j = 0;j<_table.rows[0].cells.length;j++)
                {                     _table.rows[i].cells[j].parentNode.style.backgroundColor = "white";
                    break;                 }             }                        if(obj.tagName == "TD")             {                 obj.parentNode.style.backgroundColor = "skyblue";                                  document.getElementById("hfPolicyItemID").value = id;                                  document.getElementById("form1").submit();                 
            }
        } 只能够提供思路.

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