formatImage.js
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/**
* 处理逻辑与helper.wxs内image方法严格一致
* 保证wx.previewImage时链接于wxs生成的链接相同
*/
let regExpWidth = RegExp('{width}', 'g');
let regExpHeight = RegExp('{height}', 'g');
let regExpMode = RegExp('{mode}', 'g');
let regExpQg = RegExp('/q/d+', 'g');
let regExpQ = RegExp('/q/d+');
let regExpQuality = RegExp('/quality/d+');
let regExpQualityg = RegExp('/quality/d+', 'g');
let regExpImageView = RegExp('imageView');
let regExpImageMogr = RegExp('imageMogr');
let defaultQuality = 75;
function image(imgUrl, w, h, mode, q) {
let urls,
query,
url;
let params = {
w: w,
h: h,
mode: mode || 2,
q: q || defaultQuality
};
if (imgUrl && (typeof imgUrl === 'string')) {
urls = imgUrl.split('?');
query = urls[1] || '';
url = urls[0];
if (url.indexOf('http:') === 0) {
url = url.replace('http:', 'https:');
}
if (!query || query === 'imageslim') {
url += params.q === defaultQuality ? '?imageslim' : '?imageView2/0/interlace/1/q/' + params.q;
imgUrl = url;
} else {
imgUrl = imgUrl.replace(regExpWidth, params.w)
.replace(regExpHeight, params.h)
.replace(regExpMode, (params.mode));
if (regExpImageView.test(query)) { // imageView2 || imageView
if (!regExpQ.test(query)) {
imgUrl += '/q/' + params.q;
} else {
imgUrl = imgUrl.replace(regExpQg, '/q/' + params.q);
}
} else if (regExpImageMogr.test(query)) {
if (!regExpQuality.test(query)) {
imgUrl += '/quality/' + params.q;
} else {
imgUrl = imgUrl.replace(regExpQualityg, '/quality/' + params.q);
}
}
}
return imgUrl;
} else {
return '';
}
}
module.exports = {
image: image
};