ESLint 主要有以下特點(diǎn)：
默認(rèn)規(guī)則包含所有 JSLint辟犀、JSHint 中存在的規(guī)則俏竞，易遷移；
規(guī)則可配置性高：可設(shè)置「警告」堂竟、「錯(cuò)誤」兩個(gè) error 等級(jí)魂毁，或者直接禁用；
包含代碼風(fēng)格檢測(cè)的規(guī)則（可以丟掉 JSCS 了）出嘹；
支持插件擴(kuò)展席楚、自定義規(guī)則。

配置
可以通過(guò)以下三種方式配置 ESLint:
使用 .eslintrc 文件（支持 JSON 和 YAML 兩種語(yǔ)法）疚漆；
在 package.json 中添加 eslintConfig 配置塊酣胀；
直接在代碼文件中定義。

規(guī)則的嚴(yán)重性(rule severity)

• "off"

• or 0 - turn the rule off 不驗(yàn)證 "warn"

• or 1 - turn the rule on as a warning(doesn’ t affect exit code) 警告 "error"

• or 2 - turn the rule on as an error(exit code is 1 when triggered) 錯(cuò)誤

（ 如有） 規(guī)則的選項(xiàng)(additional options)

"quotes": [2, "double"]

以下是.eslintrc 文件示例和解釋?zhuān)?/p>

{  
  "env": {  
    "browser": true,  
    "node": true,  
    "commonjs": true  
  },  
  "ecmaFeatures": {  
    // lambda表達(dá)式  
    "arrowFunctions": true,  
    // 解構(gòu)賦值  
    "destructuring": true,  
    // class  
    "classes": true,  
    // http://es6.ruanyifeng.com/#docs/function#函數(shù)參數(shù)的默認(rèn)值  
    "defaultParams": true,  
    // 塊級(jí)作用域娶聘，允許使用let const  
    "blockBindings": true,  
    // 允許使用模塊闻镶，模塊內(nèi)默認(rèn)嚴(yán)格模式  
    "modules": true,  
    // 允許字面量定義對(duì)象時(shí)，用表達(dá)式做屬性名  
    // http://es6.ruanyifeng.com/#docs/object#屬性名表達(dá)式  
    "objectLiteralComputedProperties": true,  
    // 允許對(duì)象字面量方法名簡(jiǎn)寫(xiě)  
    /*var o = { 
        method() { 
          return "Hello!"; 
        } 
     }; 
 
     等同于 
 
     var o = { 
       method: function() { 
         return "Hello!"; 
       } 
     }; 
    */  
    "objectLiteralShorthandMethods": true,  
    /* 
      對(duì)象字面量屬性名簡(jiǎn)寫(xiě) 
      var foo = 'bar'; 
      var baz = {foo}; 
      baz // {foo: "bar"} 
 
      // 等同于 
      var baz = {foo: foo}; 
    */  
    "objectLiteralShorthandProperties": true,  
    // http://es6.ruanyifeng.com/#docs/function#rest參數(shù)  
    "restParams": true,  
    // http://es6.ruanyifeng.com/#docs/function#擴(kuò)展運(yùn)算符  
    "spread": true,  
    // http://es6.ruanyifeng.com/#docs/iterator#for---of循環(huán)  
    "forOf": true,  
    // http://es6.ruanyifeng.com/#docs/generator  
    "generators": true,  
    // http://es6.ruanyifeng.com/#docs/string#模板字符串  
    "templateStrings": true,  
    "superInFunctions": true,  
    // http://es6.ruanyifeng.com/#docs/object#對(duì)象的擴(kuò)展運(yùn)算符  
    "experimentalObjectRestSpread": true  
  },  
  
  "rules": {  
    // 定義對(duì)象的set存取器屬性時(shí)丸升，強(qiáng)制定義get  
    "accessor-pairs": 2,  
    // 指定數(shù)組的元素之間要以空格隔開(kāi)(,后面)铆农， never參數(shù)：[ 之前和 ] 之后不能帶空格，always參數(shù)：[ 之前和 ] 之后必須帶空格  
    "array-bracket-spacing": [2, "never"],  
    // 在塊級(jí)作用域外訪問(wèn)塊內(nèi)定義的變量是否報(bào)錯(cuò)提示  
    "block-scoped-var": 0,  
    // if while function 后面的{必須與if在同一行狡耻，java風(fēng)格墩剖。  
    "brace-style": [2, "1tbs", { "allowSingleLine": true }],  
    // 雙峰駝命名格式  
    "camelcase": 2,  
    // 數(shù)組和對(duì)象鍵值對(duì)最后一個(gè)逗號(hào)， never參數(shù)：不能帶末尾的逗號(hào), always參數(shù)：必須帶末尾的逗號(hào)夷狰，  
    // always-multiline：多行模式必須帶逗號(hào)岭皂，單行模式不能帶逗號(hào)  
    "comma-dangle": [2, "never"],  
    // 控制逗號(hào)前后的空格  
    "comma-spacing": [2, { "before": false, "after": true }],  
    // 控制逗號(hào)在行尾出現(xiàn)還是在行首出現(xiàn)  
    // http://eslint.org/docs/rules/comma-style  
    "comma-style": [2, "last"],  
    // 圈復(fù)雜度  
    "complexity": [2,9],  
    // 以方括號(hào)取對(duì)象屬性時(shí)，[ 后面和 ] 前面是否需要空格, 可選參數(shù) never, always  
    "computed-property-spacing": [2,"never"],  
    // 強(qiáng)制方法必須返回值沼头，TypeScript強(qiáng)類(lèi)型爷绘，不配置  
    "consistent-return": 0,  
    // 用于指統(tǒng)一在回調(diào)函數(shù)中指向this的變量名书劝，箭頭函數(shù)中的this已經(jīng)可以指向外層調(diào)用者，應(yīng)該沒(méi)卵用了  
    // e.g [0,"that"] 指定只能 var that = this. that不能指向其他任何值土至，this也不能賦值給that以外的其他值  
    "consistent-this": 0,  
    // 強(qiáng)制在子類(lèi)構(gòu)造函數(shù)中用super()調(diào)用父類(lèi)構(gòu)造函數(shù)购对，TypeScrip的編譯器也會(huì)提示  
    "constructor-super": 0,  
    // if else while for do后面的代碼塊是否需要{ }包圍，參數(shù)：  
    //    multi  只有塊中有多行語(yǔ)句時(shí)才需要{ }包圍  
    //    multi-line  只有塊中有多行語(yǔ)句時(shí)才需要{ }包圍, 但是塊中的執(zhí)行語(yǔ)句只有一行時(shí)陶因，  
    //                   塊中的語(yǔ)句只能跟和if語(yǔ)句在同一行骡苞。if (foo) foo++; else doSomething();  
    //    multi-or-nest 只有塊中有多行語(yǔ)句時(shí)才需要{ }包圍, 如果塊中的執(zhí)行語(yǔ)句只有一行，執(zhí)行語(yǔ)句可以零另起一行也可以跟在if語(yǔ)句后面  
    //    [2, "multi", "consistent"] 保持前后語(yǔ)句的{ }一致  
    //    default: [2, "all"] 全都需要{ }包圍  
    "curly": [2, "all"],  
    // switch語(yǔ)句強(qiáng)制default分支楷扬，也可添加 // no default 注釋取消此次警告  
    "default-case": 2,  
    // 強(qiáng)制object.key 中 . 的位置解幽，參數(shù):  
    //      property，'.'號(hào)應(yīng)與屬性在同一行  
    //      object, '.' 號(hào)應(yīng)與對(duì)象名在同一行  
    "dot-location": [2, "property"],  
    // 強(qiáng)制使用.號(hào)取屬性  
    //    參數(shù)： allowKeywords：true 使用保留字做屬性名時(shí)毅否，只能使用.方式取屬性  
    //                          false 使用保留字做屬性名時(shí), 只能使用[]方式取屬性 e.g [2, {"allowKeywords": false}]  
    //           allowPattern:  當(dāng)屬性名匹配提供的正則表達(dá)式時(shí)亚铁，允許使用[]方式取值,否則只能用.號(hào)取值 e.g [2, {"allowPattern": "^[a-z]+(_[a-z]+)+$"}]  
    "dot-notation": [2, {"allowKeywords": true}],  
    // 文件末尾強(qiáng)制換行  
    "eol-last": 2,  
    // 使用 === 替代 ==  
    "eqeqeq": [2, "allow-null"],  
    // 方法表達(dá)式是否需要命名  
    "func-names": 0,  
    // 方法定義風(fēng)格，參數(shù)：  
    //    declaration: 強(qiáng)制使用方法聲明的方式螟加，function f(){} e.g [2, "declaration"]  
    //    expression：強(qiáng)制使用方法表達(dá)式的方式徘溢，var f = function() {}  e.g [2, "expression"]  
    //    allowArrowFunctions: declaration風(fēng)格中允許箭頭函數(shù)。 e.g [2, "declaration", { "allowArrowFunctions": true }]  
    "func-style": 0,  
    "generator-star-spacing": [2, { "before": true, "after": true }],  
    "guard-for-in": 0,  
    "handle-callback-err": [2, "^(err|error)$" ],  
    "indent": [2, 2, { "SwitchCase": 1 }],  
    "key-spacing": [2, { "beforeColon": false, "afterColon": true }],  
    "linebreak-style": 0,  
    "lines-around-comment": 0,  
    "max-nested-callbacks": 0,  
    "new-cap": [2, { "newIsCap": true, "capIsNew": false }],  
    "new-parens": 2,  
    "newline-after-var": 0,  
    "no-alert": 0,  
    "no-array-constructor": 2,  
    "no-caller": 2,  
    "no-catch-shadow": 0,  
    "no-cond-assign": 2,  
    "no-console": 0,  
    "no-constant-condition": 0,  
    "no-continue": 0,  
    "no-control-regex": 2,  
    "no-debugger": 2,  
    "no-delete-var": 2,  
    "no-div-regex": 0,  
    "no-dupe-args": 2,  
    "no-dupe-keys": 2,  
    "no-duplicate-case": 2,  
    "no-else-return": 0,  
    "no-empty": 0,  
    "no-empty-character-class": 2,  
    "no-empty-label": 2,  
    "no-eq-null": 0,  
    "no-eval": 2,  
    "no-ex-assign": 2,  
    "no-extend-native": 2,  
    "no-extra-bind": 2,  
    "no-extra-boolean-cast": 2,  
    "no-extra-parens": 0,  
    "no-extra-semi": 0,  
    "no-fallthrough": 2,  
    "no-floating-decimal": 2,  
    "no-func-assign": 2,  
    "no-implied-eval": 2,  
    "no-inline-comments": 0,  
    "no-inner-declarations": [2, "functions"],  
    "no-invalid-regexp": 2,  
    "no-irregular-whitespace": 2,  
    "no-iterator": 2,  
    "no-label-var": 2,  
    "no-labels": 2,  
    "no-lone-blocks": 2,  
    "no-lonely-if": 0,  
    "no-loop-func": 0,  
    "no-mixed-requires": 0,  
    "no-mixed-spaces-and-tabs": 2,  
    "no-multi-spaces": 2,  
    "no-multi-str": 2,  
    "no-multiple-empty-lines": [2, { "max": 1 }],  
    "no-native-reassign": 2,  
    "no-negated-in-lhs": 2,  
    "no-nested-ternary": 0,  
    "no-new": 2,  
    "no-new-func": 0,  
    "no-new-object": 2,  
    "no-new-require": 2,  
    "no-new-wrappers": 2,  
    "no-obj-calls": 2,  
    "no-octal": 2,  
    "no-octal-escape": 2,  
    "no-param-reassign": 0,  
    "no-path-concat": 0,  
    "no-process-env": 0,  
    "no-process-exit": 0,  
    "no-proto": 0,  
    "no-redeclare": 2,  
    "no-regex-spaces": 2,  
    "no-restricted-modules": 0,  
    "no-return-assign": 2,  
    "no-script-url": 0,  
    "no-self-compare": 2,  
    "no-sequences": 2,  
    "no-shadow": 0,  
    "no-shadow-restricted-names": 2,  
    "no-spaced-func": 2,  
    "no-sparse-arrays": 2,  
    "no-sync": 0,  
    "no-ternary": 0,  
    "no-this-before-super": 2,  
    "no-throw-literal": 2,  
    "no-trailing-spaces": 2,  
    "no-undef": 2,  
    "no-undef-init": 2,  
    "no-undefined": 0,  
    "no-underscore-dangle": 0,  
    "no-unexpected-multiline": 2,  
    "no-unneeded-ternary": 2,  
    "no-unreachable": 2,  
    "no-unused-expressions": 0,  
    "no-unused-vars": [2, { "vars": "all", "args": "none" }],  
    "no-use-before-define": 0,  
    "no-var": 0,  
    "no-void": 0,  
    "no-warning-comments": 0,  
    "no-with": 2,  
    "object-curly-spacing": 0,  
    "object-shorthand": 0,  
    "one-var": [2, { "initialized": "never" }],  
    "operator-assignment": 0,  
    "operator-linebreak": [2, "after", { "overrides": { "?": "before", ":": "before" } }],  
    "padded-blocks": 0,  
    "prefer-const": 0,  
    "quote-props": 0,  
    "quotes": [2, "single", "avoid-escape"],  
    "radix": 2,  
    "semi": [2, "never"],  
    "semi-spacing": 0,  
    "sort-vars": 0,  
    "space-after-keywords": [2, "always"],  
    "space-before-blocks": [2, "always"],  
    "space-before-function-paren": [2, "always"],  
    "space-in-parens": [2, "never"],  
    "space-infix-ops": 2,  
    "space-return-throw-case": 2,  
    "space-unary-ops": [2, { "words": true, "nonwords": false }],  
    "spaced-comment": [2, "always", { "markers": ["global", "globals", "eslint", "eslint-disable", "*package", "!"] }],  
    "strict": 0,  
    "use-isnan": 2,  
    "valid-jsdoc": 0,  
    "valid-typeof": 2,  
    "vars-on-top": 0,  
    "wrap-iife": [2, "any"],  
    "wrap-regex": 0,  
    "yoda": [2, "never"]  
  }  
}