原生js实现 table表格列宽拖拽

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<!DOCTYPE html>
<html>
<head>
    <meta charset="gbk">
    <title>table</title>
</head>
<body>
<table id="tb_3" cellspacing="0" cellpadding="2" width="100%" border="1">
    <tbody>
    <tr align="center" bgcolor="#dcdcdc">
        <td style="width:100px;">用户编号</td>
        <td>试用时间</td>
        <td>转正时间</td>
        <td>性别</td>
        <td>姓名拼音</td>
        <td>生日时间</td>
        <td>民族</td>
        <td>身高</td>
    </tr>
    <tr>
        <td>2000001</td>
        <td>1997-3-13</td>
        <td>1997-3-13</td>
        <td>1</td>
        <td>WZJ</td>
        <td>1965-3-13</td>
        <td>汉</td>
        <td>171</td>
    </tr>
    <tr>
        <td>2000045</td>
        <td>2001-2-15</td>
        <td>2001-3-15</td>
        <td>0</td>
        <td>WY</td>
        <td>1978-8-5</td>
        <td>汉</td>
        <td>162</td>
    </tr>
    <tr>
        <td>2000046</td>
        <td>2001-2-23</td>
        <td>2001-3-23</td>
        <td>0</td>
        <td>LQ</td>
        <td>2001-2-23</td>
        <td>汉</td>
        <td>171</td>
    </tr>
    </tbody>
</table>
<script type="text/javascript">
    var tTD; //用来存储当前更改宽度的Table Cell,避免快速移动鼠标的问题
    var table = document.getElementById("tb_3");
    for (j = 0; j < table.rows[0].cells.length; j++) {
        table.rows[0].cells[j].onmousedown = function () {
//记录单元格
            tTD = this;
            if (event.offsetX > tTD.offsetWidth - 10) {
                tTD.mouseDown = true;
                tTD.oldX = event.x;
                tTD.oldWidth = tTD.offsetWidth;
            }
//记录Table宽度
//table = tTD; while (table.tagName != ‘TABLE') table = table.parentElement;
//tTD.tableWidth = table.offsetWidth;
        };
        table.rows[0].cells[j].onmouseup = function () {
//结束宽度调整
            if (tTD == undefined) tTD = this;
            tTD.mouseDown = false;
            tTD.style.cursor = 'default';
        };
        table.rows[0].cells[j].onmousemove = function () {
//更改鼠标样式
            if (event.offsetX > this.offsetWidth - 10)
                this.style.cursor = 'col-resize';
            else
                this.style.cursor = 'default';
//取出暂存的Table Cell
            if (tTD == undefined) tTD = this;
//调整宽度
            if (tTD.mouseDown != null && tTD.mouseDown == true) {
                tTD.style.cursor = 'default';
                if (tTD.oldWidth + (event.x - tTD.oldX) > 0)
                    tTD.width = tTD.oldWidth + (event.x - tTD.oldX);
//调整列宽
                tTD.style.width = tTD.width;
                tTD.style.cursor = 'col-resize';
//调整该列中的每个Cell
                table = tTD;
                while (table.tagName != 'TABLE') table = table.parentElement;
                for (j = 0; j < table.rows.length; j++) {
                    table.rows[j].cells[tTD.cellIndex].width = tTD.width;
                }
//调整整个表
//table.width = tTD.tableWidth + (tTD.offsetWidth – tTD.oldWidth);
//table.style.width = table.width;
            }
        };
    }
</script>
</body>
</html>