var isString = function (value) {
|
return typeof value === 'string';
|
};
|
|
var isNumber = function (value) {
|
return typeof value === 'number';
|
};
|
|
var getFileExt = function (src) {
|
var fileUrl = src.split('?')[0];
|
var splitUlr = fileUrl.split('/');
|
var filepath = splitUlr[splitUlr.length - 1];
|
return filepath.split('.')[1] || 'jpg';
|
};
|
|
function isUrl(url) {
|
// NOCC:ToolNameCheck(非敏感词)
|
var urlReg = getRegExp(
|
'/[(http(s)?)://(www.)?a-zA-Z0-9@:%._+~#=]{2,256}.[a-z]{2,6}\b([-a-zA-Z0-9@:%_+.~#?&//=]*)/',
|
'ig',
|
);
|
|
return urlReg.test(url);
|
}
|
|
function rpx2px(rpx, screenWidth) {
|
// px / systemWidth = rpx / 750
|
var result = (rpx * (screenWidth || 375)) / 750;
|
|
return Math.round(result);
|
}
|
|
function imageMogr(url, options) {
|
if (!isString(url) || !url) return '';
|
|
if (
|
url.indexOf('qlogo.cn') !== -1 ||
|
url.indexOf('wxfile://') === 0 ||
|
url.indexOf('http://tmp/wx') === 0 ||
|
url.indexOf('imageMogr2') !== -1
|
) {
|
//qlogo.cn域名或者本地图片不做转换
|
return url;
|
} //强制转https
|
|
if (url.indexOf('http://') === 0) {
|
url = url.replace('http://', 'https://');
|
} else if (url.indexOf('//') === 0) {
|
url = 'https:' + url;
|
}
|
|
if (!options) return url;
|
|
var width = Math.ceil(options.width),
|
height = Math.ceil(options.height),
|
format = options.format,
|
_optionsQuality = options.quality,
|
quality = _optionsQuality === undefined ? 70 : _optionsQuality,
|
_optionsStrip = options.strip,
|
strip = _optionsStrip === undefined ? true : _optionsStrip,
|
crop = options.crop;
|
var isValidWidth = isNumber(width) && width > 0;
|
var isValidHeight = isNumber(height) && height > 0;
|
var imageMogrStr = '';
|
var size = '';
|
|
if (isValidWidth && isValidHeight) {
|
size = ''.concat(width, 'x').concat(height);
|
} else if (isValidWidth) {
|
size = ''.concat(width, 'x');
|
} else if (isValidHeight) {
|
size = 'x'.concat(height);
|
}
|
|
if (size) {
|
//缩放或者裁剪
|
imageMogrStr += '/'.concat(crop ? 'crop' : 'thumbnail', '/').concat(size);
|
|
if (crop) {
|
//裁剪目前需求只有以图片中心为基准
|
imageMogrStr += '/gravity/center';
|
}
|
}
|
|
if (isNumber(quality)) {
|
//质量变换
|
imageMogrStr += '/quality/'.concat(quality);
|
}
|
|
if (strip) {
|
//去除元信息
|
imageMogrStr += '/strip';
|
}
|
|
var ext = getFileExt(url);
|
|
// gif 图片不做格式转换，否则会损坏动图
|
if (ext === 'gif') {
|
imageMogrStr += '/cgif/1';
|
} else if (format) {
|
//格式转换
|
imageMogrStr += '/format/'.concat(format);
|
}
|
|
if (format === 'jpg' || (!format && (ext === 'jpg' || ext === 'jpeg'))) {
|
//渐进式 jpg 加载
|
imageMogrStr += '/interlace/1';
|
}
|
if (!imageMogrStr) return url;
|
return ''
|
.concat(url)
|
.concat(url.indexOf('?') !== -1 ? '&' : '?', 'imageMogr2')
|
.concat(imageMogrStr);
|
}
|
function getSrc(options) {
|
if (!options.src) return '';
|
|
if (options.thumbWidth || options.thumbHeight) {
|
return imageMogr(options.src, {
|
width:
|
options.mode !== 'heightFix'
|
? rpx2px(options.thumbWidth, options.systemInfo.screenWidth) *
|
options.systemInfo.pixelRatio
|
: null,
|
height:
|
options.mode !== 'widthFix'
|
? rpx2px(options.thumbHeight, options.systemInfo.screenWidth) *
|
options.systemInfo.pixelRatio
|
: null,
|
format: options.webp ? 'webp' : null,
|
});
|
}
|
|
return '';
|
}
|
|
module.exports = {
|
imageMogr: imageMogr,
|
getSrc: getSrc,
|
};
|
