'160px'.replace(/xxx/,'') => '160' '160.66px'.replace(/xxx/,'') => '160'
求解一条正则上面两种情况都能满足
// => 160 '160px'.replace(/(^d+)(.*)/, '$1') // => 160 '160.66pxpx'.replace(/(^d+)(.*)/, '$1')
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