我正在使用canvas fillrect函数绘制多个矩形。我目前正在对坐标进行硬编码，但是是否可以像对函数的函数调用一样传递这些值来填充rect？例如，如果我有10组坐标，可以使用for循环或类似方法并将其传递给fillRect吗？
<body>
<canvas id="canvas1" width="1224" height="770" position="absolute" style="border:1px solid #d3d3d3;">
<script>
var canvas = document.getElementById("canvas1");
var ctx = canvas.getContext("2d");
ctx.fillStyle = "#FF0000";
ctx.fillRect(330,0,150,75);
ctx.fillStyle = "#FF4500";
ctx.fillRect(30,80,150,75);
</script>
答案 0 :(得分：1)
是的，很容易像这样：
var j=0;
$(document).ready(function(){
var table;
function Xhr(id)
{
return $.ajax(
{type:"GET",
url:'http://localhost:8080/SSRSReports/v1/test',
dataType:'json',
cache:false,
async:true,
beforeSend:
function(){$(id).append('<img src="images/spinner.gif" class="spin"/>');
}})
.always(function(){
$(id).find('.spin').fadeOut(4000,function(){$(this).remove();
});
})
.fail(function()
{console.log("There was a problem while trying to get data at "+d);});
}
var radio=[];
var j=0;
$(document).ready(function(){
Xhr('#report').done(function (json) {
console.log(json);
var x;
jQuery_2_2_2.each(json, function (i, report) {
radio.fill(0);
if(report.testSampleOutOfStabilityIndt==1)
{
x += '<tr><td>' + report.studyId + '</td>';
x += '<td>' + report.country + '</td>';
x += '<td>' + report.investigatorName + '</td>';
x += '<td>' + report.screenId + '</td>';
x += '<td>' + report.subjectId + '</td>';
x += '<td>' + report.subjectInitials + '</td>';
x += '<td>' + report.requisitionNumber + '</td>';
x += '<td>' + report.testName + '</td>';
x += '<td>' + report.visitName + '</td>';
x += '<td>' + report.collectionDate + '</td>';
x += '<td>' + report.collectionTime + '</td>';
x += '<td>' + report.resultDate + '</td>';
x += '<td>' + report.resultTime + '</td>';
x += '<td>' + report.minutesToResult + '</td>';
x += '<td>' + report.minutesSampleStabilityLimit + '</td>';
x += '<td>' + report.testResult + '</td>';
x += '<td>' + report.daysSampleStabilityLimit + '</td>';
x += '<td>' + report.daysToResult + '</td>';
x += '<td>' + report.testSampleOutOfStabilityIndt + '</td>';
//console.log(i);
if(j==1)
{
x += '<td id="verified'+j+'"><input id="verified'+j+'" style="font-size:xx-small;" type="checkbox" onclick="handleChange(this)"></td></tr>';
}
else{
x += '<td id="verified'+j+'"><input id="verified'+j+'" style="font-size:xx-small;" type="checkbox" checked onclick="handleChange(this)"></td></tr>';
}
j++;
}
});//.each
jQuery_2_2_2('#reportbody').append(x);
table=jQuery_2_2_2('#reporttable').DataTable({
"stateSave": true,
checkboxRefresh:true,
dom: 'Bfrtip',
buttons: [
{
extend: 'excel',
exportOptions: {
orthogonal: 'sort'
}
}
],
columnDefs: [{
targets:[19],
render: function(data, type, row, meta){
if(type === 'sort'){
var $input = $(data).find('input[type="checkbox"]').addBack();
data = ($input.prop('checked')) ? "1" : "0";
}
return data;
}
}],
scrollY: true,
scrollX: true,
scrollCollapse: true,
fixedColumns: {
leftColumns: 1,
rightColumns: 1
}
});//.datatable
});//.done
});//document.ready
var k;
function handleChange(e){
[enter image description here][1]
$(e).attr('checked', !($(e).attr('checked')));
console.log(e.id);
}
th, td {
white-space: nowrap;
}
div.dataTables_wrapper {
width: 1600px;
margin: 0 auto;
}
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Reports</title>
<script type="text/javascript"
src="https://code.jquery.com/jquery-3.3.1.min.js"></script>
<link
href="https://cdn.datatables.net/1.10.19/css/jquery.dataTables.min.css"
type="text/css" rel="stylesheet" />
<link
href="https://cdn.datatables.net/fixedcolumns/3.2.6/css/fixedColumns.dataTables.min.css"
type="text/css" rel="stylesheet" />
<script src="https://code.jquery.com/jquery-2.2.2.min.js"
integrity="sha256-36cp2Co+/62rEAAYHLmRCPIych47CvdM+uTBJwSzWjI="
crossorigin="anonymous"></script>
<script
src="https://cdn.datatables.net/1.10.19/js/jquery.dataTables.min.js"></script>
<script type="text/javascript"
src="https://cdn.datatables.net/fixedcolumns/3.2.6/js/dataTables.fixedColumns.min.js"></script>
<script
src="https://cdn.datatables.net/buttons/1.5.2/js/dataTables.buttons.min.js"></script>
<link
href="https://cdn.datatables.net/buttons/1.5.2/css/buttons.dataTables.min.css" type="text/css" rel="stylesheet" />
<script type="text/javascript"
src="https://cdnjs.cloudflare.com/ajax/libs/jszip/3.1.3/jszip.min.js"></script>
<script type="text/javascript"
src="https://cdnjs.cloudflare.com/ajax/libs/pdfmake/0.1.36/pdfmake.min.js"></script>
<script type="text/javascript"
src="https://cdnjs.cloudflare.com/ajax/libs/pdfmake/0.1.36/vfs_fonts.js"></script>
<script type="text/javascript"
src="https://cdn.datatables.net/buttons/1.5.2/js/buttons.html5.min.js"></script>
<script type="text/javascript">var jQuery_2_2_2=$.noConflict(true);</script>
</head>
<body>
<form id="myform">
<div id="report" style="padding: 1% 1%">
<h2 class="section_header">
<span style="color: #18d1f2">RE</span>PORT
</h2>
</br>
<table id="reporttable" class="display" cellspacing="0" width="100%"
border="1px solid black" ; border-collapse="collapse";>
<thead>
<tr>
<th>StudyID</th>
<th>Country</th>
<th>Investigator_Name</th>
<th>ScreenID</th>
<th>SubjectID</th>
<th>Subject_Initials</th>
<th>Requisition_Number</th>
<th>Test_Name</th>
<th>Vist_Name</th>
<th>Collection_Date</th>
<th>Collection_Time</th>
<th>Result_Date</th>
<th>Result_Time</th>
<th>MinutesToResult</th>
<th>Minutes_Sample_Stability_Limit</th>
<th>Test_Result</th>
<th>Days_Sample_Stability_Limit</th>
<th>DaysToResult</th>
<th>Taste_Sample_Out_of_Stability_Ind</th>
<th>Verified ?</th>
</tr>
</thead>
<tbody id="reportbody">
</tbody>
<tfoot>
<tr>
<th>StudyID</th>
<th>Country</th>
<th>Investigator_Name</th>
<th>ScreenID</th>
<th>SubjectID</th>
<th>Subject_Initials</th>
<th>Requisition_Number</th>
<th>Test_Name</th>
<th>Vist_Name</th>
<th>Collection_Date</th>
<th>Collection_Time</th>
<th>Result_Date</th>
<th>Result_Time</th>
<th>MinutesToResult</th>
<th>Minutes_Sample_Stability_Limit</th>
<th>Test_Result</th>
<th>Days_Sample_Stability_Limit</th>
<th>DaysToResult</th>
<th>Taste_Sample_Out_of_Stability_Ind</th>
<th>Verified?</th>
</tr>
</tfoot>
</table>
</div>
<input
style="color: white; font-weight: bold; font-size: larger; width: 80px; height: 30px; background-color: deepskyblue; border: 1px solid #223445; border-radius: 18px; -webkit-border-radius: 5px; -moz-border-radius: 5px"
type="submit">
</form>
</body>
<script>
Xhr('#report').done(function (json) {
console.log(json);
var x;
jQuery_2_2_2.each(json, function (i, report) {
radio.fill(0);
if(report.testSampleOutOfStabilityIndt==1)
{
x += '<tr><td>' + report.studyId + '</td>';
x += '<td>' + report.country + '</td>';
x += '<td>' + report.investigatorName + '</td>';
x += '<td>' + report.screenId + '</td>';
x += '<td>' + report.subjectId + '</td>';
x += '<td>' + report.subjectInitials + '</td>';
x += '<td>' + report.requisitionNumber + '</td>';
x += '<td>' + report.testName + '</td>';
x += '<td>' + report.visitName + '</td>';
x += '<td>' + report.collectionDate + '</td>';
x += '<td>' + report.collectionTime + '</td>';
x += '<td>' + report.resultDate + '</td>';
x += '<td>' + report.resultTime + '</td>';
x += '<td>' + report.minutesToResult + '</td>';
x += '<td>' + report.minutesSampleStabilityLimit + '</td>';
x += '<td>' + report.testResult + '</td>';
x += '<td>' + report.daysSampleStabilityLimit + '</td>';
x += '<td>' + report.daysToResult + '</td>';
x += '<td>' + report.testSampleOutOfStabilityIndt + '</td>';
//console.log(i);
if(j==1)
{
x += '<td id="verified'+j+'"><input id="verified'+j+'" style="font-size:xx-small;" type="checkbox" onclick="handleChange(this)"></td></tr>';
}
else{
x += '<td id="verified'+j+'"><input id="verified'+j+'" style="font-size:xx-small;" type="checkbox" checked onclick="handleChange(this)"></td></tr>';
}
j++;
}
});//.each
jQuery_2_2_2('#reportbody').append(x);
table=jQuery_2_2_2('#reporttable').DataTable({
"stateSave": true,
checkboxRefresh:true,
dom: 'Bfrtip',
buttons: [
{
extend: 'excel',
exportOptions: {
orthogonal: 'sort'
}
}
],
columnDefs: [{
targets:[19],
render: function(data, type, row, meta){
if(type === 'sort'){
var $input = $(data).find('input[type="checkbox"]').addBack();
data = ($input.prop('checked')) ? "1" : "0";
}
return data;
}
}],
scrollY: true,
scrollX: true,
scrollCollapse: true,
fixedColumns: {
leftColumns: 1,
rightColumns: 1
}
});//.datatable
});//.done
});/
function handleChange(e){
$(e).attr('checked', !($(e).attr('checked')));
}