//将图片压缩并转变为base64
convertImgToBase64:function(url,callback, bili){ //path绝对路径
var _this = this;
var bitmap = new plus.nativeObj.Bitmap(“test”); //test标识谁便取
// 从本地加载Bitmap图片
// alert(JSON.stringify(bitmap))
bitmap.load(url,function(){
var base4=bitmap.toBase64Data();
var datastr=base4.split(’,’,3);
_this.pics = [];
if(datastr.length>1){
_this.pics.push(datastr[1]);
}else {
_this.pics.push(datastr[0]);
}
_this.srcimg = “data:image/png;base64,”+ _this.pics[0];
var str = _this.srcimg.replace(‘data:image/png;base64,’, ‘’);
var equalIndex = str.indexOf(’=’);
if (str.indexOf(’=’) > 0) {
str = str.substring(0, equalIndex);
}
var strLength = str.length;
var fileLength = parseInt(strLength - (strLength / 8) * 2);
// 由字节转换为KB
var size = “”;
size = (fileLength / 1024).toFixed(2);
if(size>2048){
mui.toast(‘上传的图片不可大于2M’);
return;
}
callback(_this.srcimg);
},(e)=>{alert('加载图片失败：'+JSON.stringify(e));}); },
第二种
/打开相机功能，拿到照片的路径/
function getImage() {
var c = plus.camera.getCamera();
c.captureImage(function(e) {
plus.io.resolveLocalFileSystemURL(e, function(entry) {
var imgSrc = entry.toLocalURL() + “?version=” + new Date().getTime(); //拿到图片路径
drawImage(imgSrc);
vue.headerImage = [];
vue.headerImage.push(imgSrc);
}, function(e) {
console.log(“读取拍照文件错误：” + e.message);
});
}, function(s) {
console.log(“error” + s);
}, {
filename: “_doc/camera/”
})
};
/** 打开手机相册,从中选取图片 **/
function galleryImg(){
// 从相册中选择图片
plus.gallery.pick( function(e){
console.log(JSON.stringify(e))
vue.headerImage = [];
vue.headerImage.push(e);
drawImage(e);
}, function (e) {
console.log( “取消选择图片” );
},{
filter: “image”,
multiple: false,
maximum: 1,
system: false,
onmaxed: function() {
plus.nativeUI.toast(‘只能选择1张图片’);
}
});
};
//自动生成四个尺寸的图片
function drawImage(img){
draw(750, 356, img,function(imgdata){
banner = imgdata;
});
draw(240,180,img, function(imgdata){
recommend = imgdata;
});
draw(350,490,img, function(imgdata){
big_recommend = imgdata;
});
draw(350,240, img, function(imgdata){
small_recommend = imgdata;
});
};
var equipmentType = "";var agent = navigator.userAgent.toLowerCase();var android = agent.indexOf("android");var iphone = agent.indexOf("iphone");// var ipad = agent.indexOf("ipad");//iosif(iphone != -1){equipmentType = "ios";function draw(w,h,imgSrc,fn){var c=document.createElement('canvas'),ctx=c.getContext('2d');var imgDataBase = null;c.width= w;c.height= h;ctx.rect(0,0,c.width,c.height);ctx.fillStyle='#fff';ctx.fill();var img = new Image;img.src = imgSrc;img.onload = function(){var oW = img.width;var oH = img.height;var x=0,y=0;var cW = c.width;var cH = c.height;var scale = 0; //定义一个缩放倍数//定义画布和图片的宽高比var cRatio = w/h;var oRatio = oW/oH;if(cRatio<=oRatio){scale = h/oH;y = 0;x = (oW*scale - w)/2;}else{scale = w/oW;x = 0;y = (oH*scale - h)/2;};ctx.drawImage(img, -x, -y, oW*scale, oH*scale);var bitmap = new plus.nativeObj.Bitmap("test"); //test标识谁便取// 从本地加载Bitmap图片 bitmap.load(imgSrc,function(){ var base4=bitmap.toBase64Data(); var datastr=base4.split(',',3); imgDataBase = "data:image/png;base64,"+ datastr;var str = imgDataBase.replace('data:image/png;base64,', '');var equalIndex = str.indexOf('=');if (str.indexOf('=') > 0) {str = str.substring(0, equalIndex);}var strLength = str.length;var fileLength = parseInt(strLength - (strLength / 8) * 2);// 由字节转换为KBvar size = "";size = (fileLength / 1024).toFixed(2);if(size>2048){mui.toast('上传图片不可大于2M');return;}fn(imgDataBase);},(e)=>{alert('加载图片失败：'+JSON.stringify(e));}); };};}else if(android != -1){equipmentType = "android";function draw(w,h,imgSrc,fn){var c=document.createElement('canvas'),ctx=c.getContext('2d');var imgDataBase = null;c.width= w;c.height= h;ctx.rect(0,0,c.width,c.height);ctx.fillStyle='#fff';ctx.fill();var img = new Image;img.src = imgSrc;img.onload = function(){var oW = img.width;var oH = img.height;var x=0,y=0;var cW = c.width;var cH = c.height;var scale = 0; //定义一个缩放倍数//定义画布和图片的宽高比var cRatio = w/h;var oRatio = oW/oH;if(cRatio<=oRatio){scale = h/oH;y = 0;x = (oW*scale - w)/2;}else{scale = w/oW;x = 0;y = (oH*scale - h)/2;};ctx.drawImage(img, -x, -y, oW*scale, oH*scale); imgDataBase = c.toDataURL("image/png",0.8);// console.log(imgDataBase)fn(imgDataBase);};};}
