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function uuidv4() { | |
return 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, function(c) { | |
var r = Math.random() * 16 | 0, v = c == 'x' ? r : (r & 0x3 | 0x8); | |
return v.toString(16); | |
}); | |
} | |
console.log(uuidv4()) |
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import hoistStatics from 'hoist-non-react-statics'; | |
import React from 'react'; | |
/** | |
* Allows two animation frames to complete to allow other components to update | |
* and re-render before mounting and rendering an expensive `WrappedComponent`. | |
*/ | |
export default function deferComponentRender(WrappedComponent) { | |
class DeferredRenderWrapper extends React.Component { | |
constructor(props, context) { |
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<!DOCTYPE html> | |
<html> | |
<head> | |
<meta name="description" content="[美团面试两列排序]"> | |
<meta charset="utf-8"> | |
<meta name="viewport" content="width=device-width"> | |
<title>JS Bin</title> | |
</head> | |
<body> |
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shell判断文件,目录是否存在或者具有权限 | |
#!/bin/sh | |
Path="/var/log/httpd/" | |
File="/var/log/httpd/access.log" | |
#这里的-x 参数判断$Path是否存在并且是否具有可执行权限 | |
if [ ! -x "$Path"]; then | |
mkdir "$Path" | |
fi |