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42 lines
890 B
42 lines
890 B
3 years ago
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const EPS = 1e-4
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const BASE_DEVICE_WIDTH = 750
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let isIOS = false
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let deviceWidth = 0
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let deviceDPR = 0
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function checkDeviceWidth () {
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const {
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platform,
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pixelRatio,
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windowWidth
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} = __GLOBAL__.getSystemInfoSync() // uni=>__GLOBAL__ runtime 编译目标是 uni 对象，内部不允许直接使用 uni
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deviceWidth = windowWidth
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deviceDPR = pixelRatio
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isIOS = platform === 'ios'
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}
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export function upx2px (number, newDeviceWidth) {
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if (deviceWidth === 0) {
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checkDeviceWidth()
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}
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number = Number(number)
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if (number === 0) {
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return 0
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}
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let result = (number / BASE_DEVICE_WIDTH) * (newDeviceWidth || deviceWidth)
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if (result < 0) {
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result = -result
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}
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result = Math.floor(result + EPS)
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if (result === 0) {
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if (deviceDPR === 1 || !isIOS) {
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result = 1
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} else {
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result = 0.5
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}
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}
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return number < 0 ? -result : result
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}
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