大家好，我正在尝试下载div的图片。为此，我尝试了以下操作，请进一步指导我。
$(function() {
$("#btnSave").click(function() {
html2canvas($("#widget"), {
onrendered: function(canvas) {
theCanvas = canvas;
alert(theCanvas);
}
});
});
}); body {
font-family: "Lucida Grande", "Lucida Sans", Arial, sans-serif;
font-family: "HelveticaNeue-Light", "Helvetica Neue Light", "Helvetica Neue", Helvetica, Arial, "Lucida Grande", sans-serif;
}
.dataset {
float: left;
vertical-align: top;
}
.widget {
display: inline-block;
background-color: white;
font-size: 14px !important;
line-height: 20px !important;
margin: 5px;
vertical-align: top;
color: #333;
border-radius: 5px;
margin: 10px;
padding-bottom: 20px;
border: 1px solid lightgray;
border-radius:5px;
-webkit-border-radius: 5px;
display: inline-block;
page-break-after: always;
}
.widget .header p {
padding: 10px;
border-bottom: 1px solid lightgrey;
max-width: 360px;
}
.widget .header .title {
font-weight: bold;
vertical-align: middle;
min-height: 36px;
padding: 5px 10px 5px 10px;
}
.widget .header:hover {
background-color: #f4f4f4;
}
.widget .header .title.selected {
border-color: cornflowerblue;
background-color: #EEF;
}
.widget .content {
padding: 5px;
overflow-y: auto;
max-height: 400px;
}
.autolayout {
display: inline-block;
}
.element {
width: 360px;
}
.compact .content {
display: table;
width: 100%;
}
.compact .row {
display: table-row;
width: 100%;
}
.compact .cell {
display: table-cell;
}
.compact .row.selected {
background-color: #eee;
}
.toolbar {
display: block;
vertical-align: top;
margin: 10px;
}
.toolbar .basis {
min-width: 100px;
}
.btn {
/*min-width: 60px;*/
}
.cell.value {
overflow: hidden;
text-wrap: none;
white-space: nowrap;
text-overflow: ellipsis;
text-align: right;
padding-right: 10px;
}
.cell.freq {
width: 60px;
}
.cell.glyph {
vertical-align: middle;
width: 100px;
}
.element {
}
.element table {
table-layout: fixed;
width: 100%;
}
.element td {
padding: 0px;
}
.element .selectable:hover {
background-color: #f4f4f4;
}
.element .stat {
text-align: right;
padding-right: 20px;
font-weigth: bold;
color: darkgray;
}
.element .bar {
height: 18px;
display: inline-block;
float: left;
}
.bar-both {
background-color: #0a67a3 !important;
}
.bar-fg {
background-color: #3e97d1 !important;
}
.bar-bg {
background-color: #ddd !important;
}
.selected .bar-fg {
background-color: #FC0;
}
.selected .bar-both {
background-color:#FA0;
}
tr.selected {
background-color: #eee;
}
.crosstab .selectable:hover {
background-color: #f4f4f4;
}
.crosstab tr.selected {
background-color: #eee;
}
.crosstab .header p {
max-width: 600px;
}
.crosstab td {
padding: 0 5px 0 5px;
text-align: right;
}
.crosstab td.value {
min-width: 60px;
max-width: 240px;
text-align: left;
}
.crosstab .cell {
vertical-align: top;
}
.crosstab th.cell {
max-width: 120px;
overflow: hidden;
white-space: normal;
text-overflow: ellipsis;
text-align: right;
padding-right: 10px;
vertical-align: bottom;
}
.crosstab .n {
color: darkgray;
}
.fieldlist {
}
.constraints {
min-width:300px;
padding: 10px;
border-radius:5px;
-webkit-border-radius: 5px;
}
.constraints table {
width: 100%;
}
.sidenote {
max-width:300px;
padding: 0 10px 0px 10px;
display: inline-block;
vertical-align: top;
}
.headnote {
max-width: 600px;
padding: 10px;
margin: 10px;
display: inline-block;
}
.info-block {
/*border: 1px solid lightgrey;*/
background-color: #eee;
vertical-align: top;
margin: 10px;
padding: 10px;
display: block;
/*box-shadow: 0 0 0 0px #9bc0cf, 0 0 0 3px #e0ebf0;*/
}
.menu-item {
}
.menu-item-value {
text-align: right;
float: right;
}
.gradient-blue {
background: #b8e1fc; /* Old browsers */
/* IE9 SVG, needs conditional override of 'filter' to 'none' */
background: url(data:image/svg+xml;base64,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);
background: -moz-linear-gradient(top, #b8e1fc 0%, #a9d2f3 10%, #90bae4 25%, #90bcea 37%, #90bff0 50%, #6ba8e5 51%, #a2daf5 83%, #bdf3fd 100%); /* FF3.6+ */
background: -webkit-gradient(linear, left top, left bottom, color-stop(0%, #b8e1fc), color-stop(10%, #a9d2f3), color-stop(25%, #90bae4), color-stop(37%, #90bcea), color-stop(50%, #90bff0), color-stop(51%, #6ba8e5), color-stop(83%, #a2daf5), color-stop(100%, #bdf3fd)); /* Chrome,Safari4+ */
background: -webkit-linear-gradient(top, #b8e1fc 0%, #a9d2f3 10%, #90bae4 25%, #90bcea 37%, #90bff0 50%, #6ba8e5 51%, #a2daf5 83%, #bdf3fd 100%); /* Chrome10+,Safari5.1+ */
background: -o-linear-gradient(top, #b8e1fc 0%, #a9d2f3 10%, #90bae4 25%, #90bcea 37%, #90bff0 50%, #6ba8e5 51%, #a2daf5 83%, #bdf3fd 100%); /* Opera 11.10+ */
background: -ms-linear-gradient(top, #b8e1fc 0%, #a9d2f3 10%, #90bae4 25%, #90bcea 37%, #90bff0 50%, #6ba8e5 51%, #a2daf5 83%, #bdf3fd 100%); /* IE10+ */
background: linear-gradient(to bottom, #b8e1fc 0%, #a9d2f3 10%, #90bae4 25%, #90bcea 37%, #90bff0 50%, #6ba8e5 51%, #a2daf5 83%, #bdf3fd 100%); /* W3C */
filter: progid:DXImageTransform.Microsoft.gradient(startColorstr='#b8e1fc', endColorstr='#bdf3fd', GradientType=0); /* IE6-8 */
}<span id="widget" class="widget" field="AGE" roundby="20" description="Patient age, in years">
<div class="header ng-scope">
<div class="title ng-binding">AGE</div>
<p class="ng-binding">Patient age, in years</p>
</div>
<div class="element ng-scope">
<div ng-show="hasData()" class="content">
<table ng-model="table" class="ng-pristine ng-valid">
<colgroup>
<col/>
<col width="60x"/>
<col width="100px"/>
</colgroup>
<thead>
<tr>
<th class="cell value">Value</th>
<th class="cell freq">Freq</th>
<th class="cell value"></th>
</tr>
</thead>
<tbody>
<tr ng-repeat="rowKey in table.rowKeys | orderBy:elementRowSort " ng-click="onSelect(rowKey, $event.shiftKey)" ng-class="{true:'selected'}[isSelected(rowKey)]" data-key="0" class="selectable ng-scope">
<td class="cell value"><span tooltip="0 to 19" class="ng-scope ng-binding">0 to 19</span>
</td>
<td class="cell freq ng-binding">17.2%</td>
<td class="cell glyph">
<span class="bar bar-both" ng-style="{width: (table.getBothPct(rowKey) | barSize)+'%' }" style="width: 17.234468937875754%;"></span>
<span class="bar bar-fg" ng-style="{width: (table.getFgPct(rowKey) | barSize) +'%' }" style="width: 0%;"></span>
<span class="bar bar-bg" ng-style="{width: (table.getBgPct(rowKey) | barSize) +'%' }" style="width: 0%;"></span>
</td>
</tr><tr ng-repeat="rowKey in table.rowKeys | orderBy:elementRowSort " ng-click="onSelect(rowKey, $event.shiftKey)" ng-class="{true:'selected'}[isSelected(rowKey)]" data-key="20" class="selectable ng-scope">
<td class="cell value"><span tooltip="20 to 39" class="ng-scope ng-binding">20 to 39</span>
</td>
<td class="cell freq ng-binding">18.0%</td>
<td class="cell glyph">
<span class="bar bar-both" ng-style="{width: (table.getBothPct(rowKey) | barSize)+'%' }" style="width: 18.03607214428858%;"></span>
<span class="bar bar-fg" ng-style="{width: (table.getFgPct(rowKey) | barSize) +'%' }" style="width: 0%;"></span>
<span class="bar bar-bg" ng-style="{width: (table.getBgPct(rowKey) | barSize) +'%' }" style="width: 0%;"></span>
</td>
</tr><!-- end ngRepeat: rowKey in table.rowKeys | orderBy:elementRowSort --><tr ng-repeat="rowKey in table.rowKeys | orderBy:elementRowSort " ng-click="onSelect(rowKey, $event.shiftKey)" ng-class="{true:'selected'}[isSelected(rowKey)]" data-key="40" class="selectable ng-scope">
<td class="cell value"><span tooltip="40 to 59" class="ng-scope ng-binding">40 to 59</span>
</td>
<!--<td >{{table.getRowPercent('current', rowKey) | percent}}</td>-->
<td class="cell freq ng-binding">34.3%</td>
<td class="cell glyph">
<!--<div class="bar bar-both" style="width: {{(row.current.pct * 100)||2}}px; " ></div>-->
<span class="bar bar-both" ng-style="{width: (table.getBothPct(rowKey) | barSize)+'%' }" style="width: 34.2685370741483%;"></span>
<span class="bar bar-fg" ng-style="{width: (table.getFgPct(rowKey) | barSize) +'%' }" style="width: 0%;"></span>
<span class="bar bar-bg" ng-style="{width: (table.getBgPct(rowKey) | barSize) +'%' }" style="width: 0%;"></span>
</td>
</tr><!-- end ngRepeat: rowKey in table.rowKeys | orderBy:elementRowSort --><tr ng-repeat="rowKey in table.rowKeys | orderBy:elementRowSort " ng-click="onSelect(rowKey, $event.shiftKey)" ng-class="{true:'selected'}[isSelected(rowKey)]" data-key="60" class="selectable ng-scope">
<td class="cell value"><span tooltip="60 to 79" class="ng-scope ng-binding">60 to 79</span>
</td>
<!--<td >{{table.getRowPercent('current', rowKey) | percent}}</td>-->
<td class="cell freq ng-binding">24.0%</td>
<td class="cell glyph">
<!--<div class="bar bar-both" style="width: {{(row.current.pct * 100)||2}}px; " ></div>-->
<span class="bar bar-both" ng-style="{width: (table.getBothPct(rowKey) | barSize)+'%' }" style="width: 24.04809619238477%;"></span>
<span class="bar bar-fg" ng-style="{width: (table.getFgPct(rowKey) | barSize) +'%' }" style="width: 0%;"></span>
<span class="bar bar-bg" ng-style="{width: (table.getBgPct(rowKey) | barSize) +'%' }" style="width: 0%;"></span>
</td>
</tr><!-- end ngRepeat: rowKey in table.rowKeys | orderBy:elementRowSort --><tr ng-repeat="rowKey in table.rowKeys | orderBy:elementRowSort " ng-click="onSelect(rowKey, $event.shiftKey)" ng-class="{true:'selected'}[isSelected(rowKey)]" data-key="80" class="selectable ng-scope">
<td class="cell value"><span tooltip="80 to 99" class="ng-scope ng-binding">80 to 99</span>
</td>
<!--<td >{{table.getRowPercent('current', rowKey) | percent}}</td>-->
<td class="cell freq ng-binding">6.4%</td>
<td class="cell glyph">
<!--<div class="bar bar-both" style="width: {{(row.current.pct * 100)||2}}px; " ></div>-->
<span class="bar bar-both" ng-style="{width: (table.getBothPct(rowKey) | barSize)+'%' }" style="width: 6.4128256513026045%;"></span>
<span class="bar bar-fg" ng-style="{width: (table.getFgPct(rowKey) | barSize) +'%' }" style="width: 0%;"></span>
<span class="bar bar-bg" ng-style="{width: (table.getBgPct(rowKey) | barSize) +'%' }" style="width: 0%;"></span>
</td>
</tr><!-- end ngRepeat: rowKey in table.rowKeys | orderBy:elementRowSort -->
<tr ng-show="getShowMean()" class="">
<td class="stat">Mean</td>
<td class="ng-binding">46.1</td>
</tr>
</tbody>
</table>
</div>
</div>
<!-- ngRepeat: field in getChildren(field) -->
</span>
<br/>
<input type="button" id="btnSave" value="Save PNG"/>
我正在使用HTML2Canvas和filesaver库
canvas元素位于theCanvas的该变量中，我正在尝试运行所有功能的函数，并单击此<input type="button" id="btnSave" value="Save PNG"/>即可下载我的图像。
感谢Guyzz有人帮忙