npm指定github地址和分支安装包:
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| npm install git+https://github.com:LLK/scratch-blocks.git#local-closure
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FAQs : error nunjucks@3.1.3: The engine “node” is incompatible with this module. Expected version “>= 6.9.0 <= 11.0.0-0”. Got “11.10.0”
解决方法：忽略引擎检查
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| yarn install —ignore-engines
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vc++构建环境 vsbuild
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| https://visualstudio.microsoft.com/zh-hans/thank-you-downloading-visual-studio/?sku=BuildTools&rr=https%3A%2F%2Fwww.jianshu.com%2Fp%2Fb4d739b43a23
npm install --global --production windows-build-tools
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es6字符串拼接
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| const welcome = 'You have logged in as ' + first + ' ' + last + '.'
const db = 'http://' + host + ':' + port + '/' +
简写为：
const welcome = `You have logged in as ${first} ${last}`;
const db = `http://${host}:${port}/${database}`;
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sort排序数组对象(降序)
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| var compare = function (prop) {
return function (obj1, obj2) {
var val1 = obj1[prop];
var val2 = obj2[prop];if (val1 < val2) {
return -1;
} else if (val1 > val2) {
return 1;
} else {
return 0;
}
}
}
arr.sort(compare("age"))
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es6 find函数
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| pet = pets.find(pet => pet.type ==='Dog' && pet.name === 'Tommy');
console.log(pet);
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es6展开运算符
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| const odd = [1,3,5]
const nums = [2,4,6,...odd]
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【js】：解构值
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| const observable = require('mobx/observable');
const action = require('mobx/action');
const runInAction = require('mobx/runInAction');
const store = this.props.store;
const form = this.props.form;
const loading = this.props.loading;
const errors = this.props.errors;
const entity = this.props.entity;
import { observable, action, runInAction } from 'mobx';
const { store, form, loading, errors, entity } = this.props;
const { store, form, loading, errors, entity:contact } = this.props;
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判断是否为null或者没有定义
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| const variable2 = variable1 || 'new';
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【npm】：升级node
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| npm install -g n
n stable
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【npm】：升级npm
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| npm install -g npm
npm install npm@latest -g
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