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js工具库 封装常用的工具函数 如深拷贝 时间转换日期格式化、浏览器判断等，提高开发效率
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<h1 class="page-title">Source: canvas/getBase64.js</h1>
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<pre class="prettyprint source linenums"><code>/**
* 获取图片的base64 url
* @param {string} url 图片url
* @returns {Promise} 图片base64信息
*/
export function getImgBase64(url) {
/* eslint-disable */
var Img = new Image(),
dataURL = "";
Img.setAttribute("crossOrigin", "anonymous");
Img.src = url;
return new Promise((resolve, reject) => {
Img.onload = function() {
var canvas = document.createElement("canvas"),
width = Img.width,
height = Img.height;
var ctx = canvas.getContext("2d");
var scale = 1;
ctx.scale(scale, scale);
canvas.width = width * scale;
canvas.height = height * scale;
ctx.drawImage(Img, 0, 0, width * scale, height * scale);
// ctx.drawImage(img, 0, 0);
// const dataURL = canvas.toDataURL(outputFormat);
dataURL = canvas.toDataURL("image/png");
resolve(dataURL);
};
});
}
/**
* @description: 获取图片的base64
* @param {string} url 图片url
* @returns {Promise} 图片base64信息
*/
export function getHttpBase64 (url) {
const _this = this
const imgUrl = url
window.URL = window.URL || window.webkitURL;
var xhr = new XMLHttpRequest();
xhr.open('get', imgUrl, true);
// 至关重要
xhr.responseType = 'blob';
xhr.send();
return new Promise((resolve, reject)=>{
xhr.onload = function () {
if (this.status == 200) {
// 得到一个blob对象
var blob = this.response;
// 至关重要
const oFileReader = new FileReader();
oFileReader.onloadend = function (e) {
// 此处拿到的已经是 base64的图片了
const base64 = e.target.result;
resolve(base64)
};
oFileReader.readAsDataURL(blob);
// ====为了在页面显示图片，可以删除====
// var img = document.createElement('img');
// img.onload = function (e) {
// window.URL.revokeObjectURL(img.src); // 清除释放
// };
// const src = window.URL.createObjectURL(blob);
// img.src = src
// console.log(src, 'oFileReader')
// document.getElementById("container1").appendChild(img);
// ====为了在页面显示图片，可以删除====
}
}
})
}</code></pre>
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