aaac7fed
 liuqimichale
add
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export function getNow() {
return window.performance && window.performance.now ? (window.performance.now() + window.performance.timing.navigationStart) : +new Date()
}
export function extend(target, ...rest) {
for (let i = 0; i < rest.length; i++) {
let source = rest[i]
for (let key in source) {
target[key] = source[key]
}
}
return target
}
export function isUndef(v) {
return v === undefined || v === null
}
export function getDistance(x, y) {
return Math.sqrt(x * x + y * y)
}
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