隨著技術(shù)的發(fā)展，開發(fā)的復(fù)雜度也越來越高，傳統(tǒng)開發(fā)方式將一個系統(tǒng)做成了整塊應(yīng)用，經(jīng)常出現(xiàn)的情況就是一個小小的改動或者一個小功能的增加可能會引起整體邏輯的修改，造成牽一發(fā)而動全身。通過組件化開發(fā)，可以有效實現(xiàn)單獨開發(fā)，單獨維護，而且他們之間可以隨意的進行組合。大大提升開發(fā)效率低，降低維護成本。
組件化對于任何一個業(yè)務(wù)場景復(fù)雜的前端應(yīng)用以及經(jīng)過多次迭代之后的產(chǎn)品來說都是必經(jīng)之路。組件化要做的不僅僅是表面上看到的模塊拆分解耦，其背后還有很多工作來支撐組件化的進行，例如結(jié)合業(yè)務(wù)特性的模塊拆分策略、模塊間的交互方式和構(gòu)建系統(tǒng)等等 。
本文給大家介紹的組件是：
基于html2canva jspdf 實現(xiàn)前端頁面加水印 并導(dǎo)出頁面PDF;
閱讀全文下載完整組件代碼請關(guān)注微信公眾號： 前端組件開發(fā)
效果圖如下:
代碼實現(xiàn)如下:
# 使用方法
```使用方法
<!-- 引入加入 導(dǎo)出pdf插件 -->
<script type="text/javascript" src="./static/html2canvas.js"></script>
<script type="text/javascript" src="./static/jspdf.debug.js"></script>
//? 調(diào)用頁面加水印方法
this.watermark({
"watermark_txt": "中國廣東cc.gd"
});
// 調(diào)用下載pdf報告方法
downKcReport();
```文章來源地址http://www.zghlxwxcb.cn/news/detail-772442.html
#### HTML代碼部分
```html
<template>
<view class="content">
<view class="exportPdfBtn" @click="downKcReport()">導(dǎo)出PDF</view>
<!-- 可視化 -->
<view style="background-color: white; border-radius: 4px; margin-top: -4px;">
<!-- 柱形圖 堆疊 -->
<h4 style="margin-left: 12px; font-size: 16px; height: 30px; line-height: 30px;"> 柱形圖 堆疊
</h4>
<div class="mui-content-padded">
<div id="dsj_zscq" style="width: calc(100vw - 40px); height: 280px;"></div>
</div>
<!-- 折線圖 -->
<h4 style="margin-left: 12px; font-size: 16px; height: 30px; line-height: 30px;"> 折線圖
</h4>
<div class="mui-content-padded">
<div id="dsj_cxcg" style="width: calc(100vw - 40px); margin: -18px 0px; height: 280px;">
</div>
</div>
<!-- 柱狀圖 + 折線圖-->
<h4 style="margin-left: 12px; font-size: 16px; height: 30px; line-height: 30px; margin-top: 0px;">
柱狀圖 + 折線圖 </h4>
<div class="mui-content-padded">
<div id="dsj_zlhjl" style="width: calc(100vw - 40px); height: 290px;"></div>
</div>
<!-- 有效知識產(chǎn)權(quán)結(jié)構(gòu) -->
<h4 style="margin-left: 12px; font-size: 16px; height: 30px; line-height: 30px; margin-top: 0px;">
餅圖 </h4>
<div class="mui-content-padded">
<div id="dsj_zscqjg" style="width: calc(100vw - 40px); height: 306px;"></div>
</div>
<!-- 專利iPC結(jié)構(gòu) -->
<h4 style="margin-left: 12px; font-size: 16px; height: 30px; line-height: 30px; margin-top: 0px;">
樹形結(jié)構(gòu)圖 </h4>
<div class="mui-content-padded">
<div id="dsj_zlipc_content"
style="margin-left: -10px;? width: calc(100vw - 40px); height: auto; margin-bottom: 30px;">
</div>
</div>
<!-- 柱狀圖 -->
<h4 style="margin-left: 12px; font-size: 16px; height: 30px; line-height: 30px; margin-top: 0px;">
柱狀圖 </h4>
<div class="mui-content-padded">
<div id="dsj_zljz" style="width: calc(100vw - 40px); height: 280px;"></div>
</div>
<!-- 專利法律狀態(tài)分布 -->
<h4 style="margin-left: 12px; font-size: 16px; height: 30px; line-height: 30px; margin-top: 0px;">
餅圖 </h4>
<div class="mui-content-padded">
<div id="dsj_zlfl" style="width: calc(100vw - 40px); height: 280px;"></div>
</div>
<!-- 專利壽命分布 -->
<h4 style="margin-left: 12px; font-size: 16px; height: 30px; line-height: 30px; margin-top: 0px;">
柱狀圖 </h4>
<div class="mui-content-padded">
<div id="dsj_zlsm" style="width: calc(100vw - 40px); height: 280px;"></div>
</div>
<!-- 樹形結(jié)構(gòu)圖 -->
<h4 style="margin-left: 12px; font-size: 16px; height: 30px; line-height: 30px; margin-top: 0px;">
樹形結(jié)構(gòu)圖 </h4>
<div class="mui-content-padded">
<div id="dsj_zllhsq" style="width: calc(100vw - 40px); height: auto; margin-bottom: 30px;">
</div>
</div>
</view>
</view>
</template>
```
#### JS代碼 （引入組件 填充數(shù)據(jù)）
```javascript
<script>
import myIndex from '../index/index.js'
export default {
data() {
return {
title: 'Hello'
}
},
mounted() {
// 刷新Echart數(shù)據(jù)
this.refreshEchartData();
},
onLoad() {
//? 頁面加水印方法
this.watermark({
"watermark_txt": "中國廣東cc.gd"
});
},
methods: {
//? 頁面加水印方法
watermark(settings) {
//默認設(shè)置
var defaultSettings = {
watermark_txt: "text",
watermark_x: 20, //水印起始位置x軸坐標(biāo)
watermark_y: 80, //水印起始位置Y軸坐標(biāo)
watermark_rows: 80, //水印行數(shù)
watermark_cols: 20, //水印列數(shù)
watermark_x_space: 80, //水印x軸間隔
watermark_y_space: 102, //水印y軸間隔
watermark_color: '#aaa', //水印字體顏色
watermark_alpha: 0.4, //水印透明度
watermark_fontsize: '14px', //水印字體大小
watermark_font: '微軟雅黑', //水印字體
watermark_width: 180, //水印寬度
watermark_height: 80, //水印長度
watermark_angle: 20 //水印傾斜度數(shù)
};
//采用配置項替換默認值，作用類似jquery.extend
if (arguments.length === 1 && typeof arguments[0] === "object") {
console.log("arguments = " + JSON.stringify(arguments[0]));
// 獲取參數(shù)配置
var src = arguments[0];
for (let key in src) {
if (src[key] && defaultSettings[key] && src[key] === defaultSettings[key])
continue;
else if (src[key])
defaultSettings[key] = src[key];
}
}
var oTemp = document.createDocumentFragment();
//獲取頁面最大寬度
var page_width = Math.max(document.body.scrollWidth, document.body.clientWidth);
var cutWidth = page_width * 0.0150;
var page_width = page_width - cutWidth;
//獲取頁面最大高度
var page_height = Math.max(document.body.scrollHeight, document.body.clientHeight) + 2860;
// var page_height = document.body.scrollHeight+document.body.scrollTop;
//如果將水印列數(shù)設(shè)置為0，或水印列數(shù)設(shè)置過大，超過頁面最大寬度，則重新計算水印列數(shù)和水印x軸間隔
if (defaultSettings.watermark_cols == 0 || (parseInt(defaultSettings.watermark_x + defaultSettings
.watermark_width * defaultSettings.watermark_cols + defaultSettings.watermark_x_space * (
defaultSettings.watermark_cols - 1)) > page_width)) {
defaultSettings.watermark_cols = parseInt((page_width - defaultSettings.watermark_x + defaultSettings
.watermark_x_space) / (defaultSettings.watermark_width + defaultSettings
.watermark_x_space));
defaultSettings.watermark_x_space = parseInt((page_width - defaultSettings.watermark_x -
defaultSettings
.watermark_width * defaultSettings.watermark_cols) / (defaultSettings.watermark_cols - 1));
}
//如果將水印行數(shù)設(shè)置為0，或水印行數(shù)設(shè)置過大，超過頁面最大長度，則重新計算水印行數(shù)和水印y軸間隔
if (defaultSettings.watermark_rows == 0 || (parseInt(defaultSettings.watermark_y + defaultSettings
.watermark_height * defaultSettings.watermark_rows + defaultSettings.watermark_y_space * (
defaultSettings.watermark_rows - 1)) > page_height)) {
defaultSettings.watermark_rows = parseInt((defaultSettings.watermark_y_space + page_height -
defaultSettings
.watermark_y) / (defaultSettings.watermark_height + defaultSettings.watermark_y_space));
defaultSettings.watermark_y_space = parseInt(((page_height - defaultSettings.watermark_y) -
defaultSettings
.watermark_height * defaultSettings.watermark_rows) / (defaultSettings.watermark_rows - 1));
}
var x;
var y;
for (var i = 0; i < defaultSettings.watermark_rows; i++) {
y = defaultSettings.watermark_y + (defaultSettings.watermark_y_space + defaultSettings
.watermark_height) * i;
for (var j = 0; j < defaultSettings.watermark_cols; j++) {
x = defaultSettings.watermark_x + (defaultSettings.watermark_width + defaultSettings
.watermark_x_space) *
j;
var mask_div = document.createElement('div');
mask_div.id = 'mask_div' + i + j;
mask_div.className = 'mask_div';
mask_div.appendChild(document.createTextNode(defaultSettings.watermark_txt));
//設(shè)置水印div傾斜顯示
mask_div.style.webkitTransform = "rotate(-" + defaultSettings.watermark_angle + "deg)";
mask_div.style.MozTransform = "rotate(-" + defaultSettings.watermark_angle + "deg)";
mask_div.style.msTransform = "rotate(-" + defaultSettings.watermark_angle + "deg)";
mask_div.style.OTransform = "rotate(-" + defaultSettings.watermark_angle + "deg)";
mask_div.style.transform = "rotate(-" + defaultSettings.watermark_angle + "deg)";
mask_div.style.visibility = "";
mask_div.style.position = "absolute";
mask_div.style.left = x + 'px';
mask_div.style.top = y + 'px';
mask_div.style.overflow = "hidden";
mask_div.style.zIndex = "9999";
mask_div.style.pointerEvents = 'none'; //pointer-events:none? 讓水印不遮擋頁面的點擊事件
//mask_div.style.border="solid #eee 1px";
mask_div.style.opacity = defaultSettings.watermark_alpha;
mask_div.style.fontSize = defaultSettings.watermark_fontsize;
mask_div.style.fontFamily = defaultSettings.watermark_font;
mask_div.style.color = defaultSettings.watermark_color;
mask_div.style.textAlign = "center";
mask_div.style.width = defaultSettings.watermark_width + 'px';
mask_div.style.height = defaultSettings.watermark_height + 'px';
mask_div.style.display = "block";
oTemp.appendChild(mask_div);
};
};
document.body.appendChild(oTemp);
},
// 下載pdf報告
downKcReport() {
html2canvas(
document.body, {
scale: 2,
dpi: 192, //導(dǎo)出pdf清晰度
onrendered: function(canvas) {
var contentWidth = canvas.width;
var contentHeight = canvas.height;
//一頁pdf顯示html頁面生成的canvas高度;
var pageHeight = contentWidth / 592.28 * 841.89;
//未生成pdf的html頁面高度
var leftHeight = contentHeight;
//pdf頁面偏移
var position = 0;
//html頁面生成的canvas在pdf中圖片的寬高（a4紙的尺寸[595.28,841.89]）
var imgWidth = 595.28;
var imgHeight = 592.28 / contentWidth * contentHeight;
var pageData = canvas.toDataURL('image/jpeg', 1.0);
var pdf = new jsPDF('', 'pt', 'a4');
//有兩個高度需要區(qū)分，一個是html頁面的實際高度，和生成pdf的頁面高度(841.89)
//當(dāng)內(nèi)容未超過pdf一頁顯示的范圍，無需分頁
if (leftHeight < pageHeight) {
pdf.addImage(pageData, 'JPEG', 0, 0, imgWidth, imgHeight);
} else {
while (leftHeight > 0) {
pdf.addImage(pageData, 'JPEG', 0, position, imgWidth, imgHeight)
leftHeight -= pageHeight;
position -= 841.89;
//避免添加空白頁
if (leftHeight > 0) {
pdf.addPage();
}
}
}
pdf.save(name + '.pdf');
console.log('成功導(dǎo)出pdf');
},
//背景設(shè)為白色（默認為黑色）
background: "#fff"
})
},
refreshEchartData() {
// 返回數(shù)據(jù)需在json轉(zhuǎn)換格式工具 轉(zhuǎn)成Json格式
let result = {
"data": {
"unionCompanyNum": 4,
"goldList": [{
"isNewRecord": true,
"comId": "1",
"socialCode": "123456",
"fmsqYx": "1",
"cfmwyxzscqsl": "1",
"years": "1",
"yxzscqsl": "1",
"dnzlhjl": "1"
}],
"patentLifeList": [{
"isNewRecord": true,
"comId": "1",
"socialCode": "123456",
"percentage": "1",
"quantity": "1",
"scope": "1-3",
"totalNum": "1"
}, {
"isNewRecord": true,
"comId": "1",
"socialCode": "123456",
"percentage": "1",
"quantity": "1",
"scope": "3-5",
"totalNum": "2"
}, {
"isNewRecord": true,
"comId": "1",
"socialCode": "123456",
"percentage": "1",
"quantity": "3",
"scope": "5-10",
"totalNum": "3"
}, {
"isNewRecord": true,
"comId": "1",
"socialCode": "123456",
"percentage": "1",
"quantity": "3",
"scope": "10-",
"totalNum": "4"
}],
"patentValueList": [{
"isNewRecord": true,
"comId": "1",
"socialCode": "123456",
"fmgbZs": "1",
"fmsqYx": "1",
"syxxYx": "1",
"wgsjYx": "1",
"scope": "0-5",
"totalNum": "1",
"percentageHighRights": "1",
"percentageHigh": "1",
"dspw": "1",
"jslypw": "1"
}, {
"isNewRecord": true,
"comId": "1",
"socialCode": "123456",
"fmgbZs": "1",
"fmsqYx": "1",
"syxxYx": "1",
"wgsjYx": "1",
"scope": "5-10",
"totalNum": "1",
"percentageHighRights": "1",
"percentageHigh": "1",
"dspw": "1",
"jslypw": "1"
}, {
"isNewRecord": true,
"comId": "1",
"socialCode": "123456",
"fmgbZs": "1",
"fmsqYx": "2",
"syxxYx": "3",
"wgsjYx": "4",
"scope": "90-100",
"totalNum": "10"
}],
"legalList": [{
"isNewRecord": true,
"comId": "1",
"socialCode": "123456",
"underTrial": "1",
"invalid": "1",
"efficient": "1",
"totalNum": "1",
"percentage": "1"
}],
"propertyRightList": [{
"isNewRecord": true,
"comId": "1",
"socialCode": "123456",
"fmgbZs": "1",
"fmgbZsP": "1",
"fmsqYx": "1",
"fmsqYxP": "1",
"syxxYx": "1",
"syxxYxP": "1",
"wgsjYx": "1",
"wgsjYxP": "1",
"rzYx": "1",
"rzYxP": "1",
"maxPercentage": "1",
"maxPercentageRights": "1",
"dspw": "1",
"jslypw": "1"
}],
"unionPatentNum": 13,
"ipcList": [{
"isNewRecord": true,
"comId": "1",
"socialCode": "123456",
"ipcDept": "1",
"ipcClass": "1",
"ipcNum": "1",
"ipcZbClass": "1",
"ipcZb": "1",
"dspw": "1",
"jslypw": "1"
}],
"yearList": [{
"isNewRecord": true,
"comId": "1",
"fmgbZs": "1",
"fmsqYx": "1",
"syxxYx": "1",
"wgsjYx": "1",
"rzYx": "1",
"years": "2022",
"dnkjcxcgkbjshl": "1",
"socialCode": "123456"
}, {
"isNewRecord": true,
"comId": "1",
"years": "2023",
"dnkjcxcgkbjshl": "2",
"socialCode": "123456"
}, {
"isNewRecord": true,
"comId": "1",
"years": "2026",
"dnkjcxcgkbjshl": "6",
"socialCode": "123456"
}, {
"isNewRecord": true,
"comId": "1",
"years": "2027",
"dnkjcxcgkbjshl": "7",
"socialCode": "123456"
}],
"unionList": [{
"isNewRecord": true,
"comId": "1",
"socialCode": "123456",
"unionName": "測試5",
"unionNum": "5",
"unionCompany": "1"
}, {
"isNewRecord": true,
"comId": "1",
"socialCode": "123456",
"unionName": "測試4",
"unionNum": "4",
"unionCompany": "1"
}, {
"isNewRecord": true,
"comId": "1",
"socialCode": "123456",
"unionName": "測試3",
"unionNum": "3",
"unionCompany": "1"
}, {
"isNewRecord": true,
"comId": "1",
"socialCode": "123456",
"unionName": "測試1",
"unionNum": "1",
"unionCompany": "1"
}]
},
"statusCode": 200,
"header": {
"date": "Tue, 30 May 2023 07:08:28 GMT",
"powered-by": "JeeSite V5.0.1 0",
"transfer-encoding": "chunked",
"content-type": "application/json"
},
"errMsg": "request:ok"
};
let resultData = result.data;
if (resultData.yearList != undefined && resultData.yearList.length > 0) {
console.log('執(zhí)行圖表1');
// 填充圖表1 2
myIndex.fillChartOneTwo(resultData.yearList);
}
if (resultData.goldList != undefined && resultData.goldList.length > 0) {
// 填充圖表3
myIndex.fillChartThree(resultData.goldList);
}
if (resultData.propertyRightList != undefined && resultData.propertyRightList.length > 0) {
// 填充圖表4
myIndex.fillChartFour(resultData.propertyRightList);
}
if (resultData.ipcList != undefined && resultData.ipcList.length > 0) {
// 填充圖表5
myIndex.fillChartFive(resultData.ipcList);
}
if (resultData.patentValueList != undefined && resultData.patentValueList.length > 0) {
// 填充圖表6
myIndex.fillChartSix(resultData.patentValueList);
}
if (resultData.legalList != undefined && resultData.legalList.length > 0) {
// 填充圖表7 法律
myIndex.fillChartSeven(resultData.legalList);
}
if (resultData.patentLifeList != undefined && resultData.patentLifeList.length > 0) {
// 填充圖表8 壽命
myIndex.fillChartEight(resultData.patentLifeList);
}
if (resultData.unionList != undefined && resultData.unionList.length > 0) {
// 填充圖表9 專利聯(lián)合
myIndex.fillChartNine(resultData, "廣汽集團");
}
}
}
}
</script>
```
#### CSS
```CSS
<style>
.content {
display: flex;
flex-direction: column;
align-items: center;
justify-content: center;
}
.mui-content-padded {
margin: 10px 8px;
}
.mui-content-padded div {
font-size: 13px;
}
.exportPdfBtn {
width: 100px;
height: 40px;
line-height: 40px;
margin-top: 20px;
background-color: greenyellow;
text-align: center;
}
</style>文章來源：http://www.zghlxwxcb.cn/news/detail-772442.html
```
到了這里，關(guān)于前端vue基于html2canva jspdf 實現(xiàn)前端頁面加水印 并導(dǎo)出頁面PDF的文章就介紹完了。如果您還想了解更多內(nèi)容，請在右上角搜索TOY模板網(wǎng)以前的文章或繼續(xù)瀏覽下面的相關(guān)文章，希望大家以后多多支持TOY模板網(wǎng)！
