我正在编辑一个laravel项目，我想添加一个签名功能。我在下面有这段代码，它是移动响应的。但我不知道如何将它连接到现有的 例如，服务器名称：localhost。用户名：db_test。密码：db123。数据库名称：db_test
我想要插入它的表是$booking->signature。
<?php
if(isset($_POST['signaturesubmit'])){
$signature = $_POST['signature'];
$signatureFileName = uniqid().'.png';
$signature = str_replace('data:image/png;base64,', '', $signature);
$signature = str_replace(' ', '+', $signature);
$data = base64_decode($signature);
$file = 'signatures/'.$signatureFileName;
file_put_contents($file, $data);
$msg = "<div class='alert alert-success'>Signature Uploaded</div>";
}
?>
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.4.0/css/bootstrap.min.css">
<style>
#canvasDiv{
position: relative;
border: 2px dashed grey;
height:300px;
}
</style>
</head>
<body>
<div class="container">
<div class="row">
<div class="col-md-8 col-md-offset-2">
<br>
<?php echo isset($msg)?$msg:''; ?>
<h2>Sign Here</h2>
<hr>
<div id="canvasDiv"></div>
<br>
<button type="button" class="btn btn-danger" id="reset-btn">Clear</button>
<button type="button" class="btn btn-success" id="btn-save">Save</button>
</div>
<form id="signatureform" action="" style="display:none" method="post">
<input type="hidden" id="signature" name="signature">
<input type="hidden" name="signaturesubmit" value="1">
</form>
</div>
</div>
</body>
<script src="https://code.jquery.com/jquery-3.4.1.slim.min.js" integrity="sha256-pasqAKBDmFT4eHoN2ndd6lN370kFiGUFyTiUHWhU7k8=" crossorigin="anonymous"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/html2canvas/0.5.0-beta4/html2canvas.min.js"></script>
<script>
$(document).ready(() => {
var canvasDiv = document.getElementById('canvasDiv');
var canvas = document.createElement('canvas');
canvas.setAttribute('id', 'canvas');
canvasDiv.appendChild(canvas);
$("#canvas").attr('height', $("#canvasDiv").outerHeight());
$("#canvas").attr('width', $("#canvasDiv").width());
if (typeof G_vmlCanvasManager != 'undefined') {
canvas = G_vmlCanvasManager.initElement(canvas);
}
context = canvas.getContext("2d");
$('#canvas').mousedown(function(e) {
var offset = $(this).offset()
var mouseX = e.pageX - this.offsetLeft;
var mouseY = e.pageY - this.offsetTop;
paint = true;
addClick(e.pageX - offset.left, e.pageY - offset.top);
redraw();
});
$('#canvas').mousemove(function(e) {
if (paint) {
var offset = $(this).offset()
//addClick(e.pageX - this.offsetLeft, e.pageY - this.offsetTop, true);
addClick(e.pageX - offset.left, e.pageY - offset.top, true);
console.log(e.pageX, offset.left, e.pageY, offset.top);
redraw();
}
});
$('#canvas').mouseup(function(e) {
paint = false;
});
$('#canvas').mouseleave(function(e) {
paint = false;
});
var clickX = new Array();
var clickY = new Array();
var clickDrag = new Array();
var paint;
function addClick(x, y, dragging) {
clickX.push(x);
clickY.push(y);
clickDrag.push(dragging);
}
$("#reset-btn").click(function() {
context.clearRect(0, 0, window.innerWidth, window.innerWidth);
clickX = [];
clickY = [];
clickDrag = [];
});
$(document).on('click', '#btn-save', function() {
var mycanvas = document.getElementById('canvas');
var img = mycanvas.toDataURL("image/png");
anchor = $("#signature");
anchor.val(img);
$("#signatureform").submit();
});
var drawing = false;
var mousePos = {
x: 0,
y: 0
};
var lastPos = mousePos;
canvas.addEventListener("touchstart", function(e) {
mousePos = getTouchPos(canvas, e);
var touch = e.touches[0];
var mouseEvent = new MouseEvent("mousedown", {
clientX: touch.clientX,
clientY: touch.clientY
});
canvas.dispatchEvent(mouseEvent);
}, false);
canvas.addEventListener("touchend", function(e) {
var mouseEvent = new MouseEvent("mouseup", {});
canvas.dispatchEvent(mouseEvent);
}, false);
canvas.addEventListener("touchmove", function(e) {
var touch = e.touches[0];
var offset = $('#canvas').offset();
var mouseEvent = new MouseEvent("mousemove", {
clientX: touch.clientX,
clientY: touch.clientY
});
canvas.dispatchEvent(mouseEvent);
}, false);
// Get the position of a touch relative to the canvas
function getTouchPos(canvasDiv, touchEvent) {
var rect = canvasDiv.getBoundingClientRect();
return {
x: touchEvent.touches[0].clientX - rect.left,
y: touchEvent.touches[0].clientY - rect.top
};
}
var elem = document.getElementById("canvas");
var defaultPrevent = function(e) {
e.preventDefault();
}
elem.addEventListener("touchstart", defaultPrevent);
elem.addEventListener("touchmove", defaultPrevent);
function redraw() {
//
lastPos = mousePos;
for (var i = 0; i < clickX.length; i++) {
context.beginPath();
if (clickDrag[i] && i) {
context.moveTo(clickX[i - 1], clickY[i - 1]);
} else {
context.moveTo(clickX[i] - 1, clickY[i]);
}
context.lineTo(clickX[i], clickY[i]);
context.closePath();
context.stroke();
}
}
})
</script>
</html> 
您必须在 .env 文件中设置数据库凭据。它位于您项目的根目录中。如果不存在，您可以重命名 .env.example 并对其进行更改。
根据您的代码（至少在 MVC 框架中与数据库的交互不是标准的），我认为最好先熟悉 Laravel。有很多资源可以学习。