微信小程序的兼容性问题

除了微信本身的 Bug 之外，微信小程序的兼容性问题主要体现在不同平台的 JavaScript 引擎对标准 API 的支持程度不同造成的。比如 Array.find() 在 Android 7.0 上是支持的，但在 Android 6.0.1 上却不支持。如果你的小程序里使用了这个 API 就引发兼容性问题。更详细的信息可以参阅微信小程序兼容性问题。

关于各个平台的标准库支持情况，可以查阅附录。

解决方案

在特定平台上，对不支持的 API 使用 polyfill 来实现。

典型地，比如 Array.fill() 函数可以使用 MDN 上的 polyfill 来实现。

作为一次性的解决方案，你可以把 polyfill.js 下载到本机，放在微信小程序指定目录下。在需要使用标准 API 的 JavaScript 文件头部插入如下代码：

import 'path/to/polyfill.js'

这样就会自动给不支持特定 API 的平台打上补丁。

TODO

添加所有不支持 API 的 polyfill 实现
完善其他平台的 API 支持情况
优化 polyfill 代码的执行效率

贡献

贡献代码的同学需要安装 node 及 jasmine-node 作为开发环境。

在 polyfill.js 里编写兼容性函数，比如：

if (!String.prototype.startsWith) {
    console.warn('define polyfill for Array.prototype.startsWith');
    String.prototype.startsWith = function (searchString, position) {
      position = position || 0;
      return this.substr(position, searchString.length) === searchString;
  };
}

在 polyfill.spec.js 里编写单元测试函数，比如：

// 设置为 null 是为了使用 polyfill.js 里定义的函数
String.prototype.startsWith = null;

...

  // 真正的测试例在这
  it('String.startsWith()', () => {
    var s = 'test string';
    expect(s.startsWith('test')).toEqual(true);
    expect(s.startsWith('string')).toEqual(false);
  });

...

运行 jasmine-node . 进行单元测试

$ jasmine-node .
define polyfill for Array.prototype.findIndex
define polyfill for Array.prototype.fill
define polyfill for String.prototype.startsWith
...

Finished in 0.008 seconds
3 tests, 12 assertions, 0 failures, 0 skipped

PR is welcome.

LICENSE

MIT

附录：不同平台 API 支持情况列表

Component.apiName	iOS 10.2	Android 6.0.1	Android 7.0	devtool
Array.toString	YES	YES	YES	YES
Array.values	YES	N/A	YES	N/A
Array.toLocaleString	YES	YES	YES	YES
Array.concat	YES	YES	YES	YES
Array.fill	YES	N/A	YES	YES
Array.join	YES	YES	YES	YES
Array.pop	YES	YES	YES	YES
Array.push	YES	YES	YES	YES
Array.reverse	YES	YES	YES	YES
Array.shift	YES	YES	YES	YES
Array.slice	YES	YES	YES	YES
Array.sort	YES	YES	YES	YES
Array.splice	YES	YES	YES	YES
Array.unshift	YES	YES	YES	YES
Array.every	YES	YES	YES	YES
Array.forEach	YES	YES	YES	YES
Array.some	YES	YES	YES	YES
Array.indexOf	YES	YES	YES	YES
Array.lastIndexOf	YES	YES	YES	YES
Array.filter	YES	YES	YES	YES
Array.reduce	YES	YES	YES	YES
Array.reduceRight	YES	YES	YES	YES
Array.map	YES	YES	YES	YES
Array.entries	YES	N/A	YES	YES
Array.keys	YES	N/A	YES	YES
Array.find	YES	N/A	YES	YES
Array.findIndex	YES	N/A	YES	YES
Array.includes	YES	N/A	N/A	YES
Array.copyWithin	YES	N/A	YES	YES
Array.constructor	YES	YES	YES	YES
Buffer	N/A	N/A	N/A	N/A
DataView.getInt8	YES	YES	YES	YES
DataView.getUint8	YES	YES	YES	YES
DataView.getInt16	YES	YES	YES	YES
DataView.getUint16	YES	YES	YES	YES
DataView.getInt32	YES	YES	YES	YES
DataView.getUint32	YES	YES	YES	YES
DataView.getFloat32	YES	YES	YES	YES
DataView.getFloat64	YES	YES	YES	YES
DataView.setInt8	YES	YES	YES	YES
DataView.setUint8	YES	YES	YES	YES
DataView.setInt16	YES	YES	YES	YES
DataView.setUint16	YES	YES	YES	YES
DataView.setInt32	YES	YES	YES	YES
DataView.setUint32	YES	YES	YES	YES
DataView.setFloat32	YES	YES	YES	YES
DataView.setFloat64	YES	YES	YES	YES
DataView.constructor	YES	YES	YES	YES
Date.toString	YES	YES	YES	YES
Date.toISOString	YES	YES	YES	YES
Date.toDateString	YES	YES	YES	YES
Date.toTimeString	YES	YES	YES	YES
Date.toLocaleString	YES	YES	YES	YES
Date.toLocaleDateString	YES	YES	YES	YES
Date.toLocaleTimeString	YES	YES	YES	YES
Date.valueOf	YES	YES	YES	YES
Date.getTime	YES	YES	YES	YES
Date.getFullYear	YES	YES	YES	YES
Date.getUTCFullYear	YES	YES	YES	YES
Date.getMonth	YES	YES	YES	YES
Date.getUTCMonth	YES	YES	YES	YES
Date.getDate	YES	YES	YES	YES
Date.getUTCDate	YES	YES	YES	YES
Date.getDay	YES	YES	YES	YES
Date.getUTCDay	YES	YES	YES	YES
Date.getHours	YES	YES	YES	YES
Date.getUTCHours	YES	YES	YES	YES
Date.getMinutes	YES	YES	YES	YES
Date.getUTCMinutes	YES	YES	YES	YES
Date.getSeconds	YES	YES	YES	YES
Date.getUTCSeconds	YES	YES	YES	YES
Date.getMilliseconds	YES	YES	YES	YES
Date.getUTCMilliseconds	YES	YES	YES	YES
Date.getTimezoneOffset	YES	YES	YES	YES
Date.setTime	YES	YES	YES	YES
Date.setMilliseconds	YES	YES	YES	YES
Date.setUTCMilliseconds	YES	YES	YES	YES
Date.setSeconds	YES	YES	YES	YES
Date.setUTCSeconds	YES	YES	YES	YES
Date.setMinutes	YES	YES	YES	YES
Date.setUTCMinutes	YES	YES	YES	YES
Date.setHours	YES	YES	YES	YES
Date.setUTCHours	YES	YES	YES	YES
Date.setDate	YES	YES	YES	YES
Date.setUTCDate	YES	YES	YES	YES
Date.setMonth	YES	YES	YES	YES
Date.setUTCMonth	YES	YES	YES	YES
Date.setFullYear	YES	YES	YES	YES
Date.setUTCFullYear	YES	YES	YES	YES
Date.setYear	YES	YES	YES	YES
Date.getYear	YES	YES	YES	YES
Date.toJSON	YES	YES	YES	YES
Date.toUTCString	YES	YES	YES	YES
Date.toGMTString	YES	YES	YES	YES
Date.constructor	YES	YES	YES	YES
Error.toString	YES	YES	YES	YES
Error.constructor	YES	YES	YES	YES
Float32Array.constructor	YES	YES	YES	YES
Float64Array.constructor	YES	YES	YES	YES
Function.constructor	YES	YES	YES	YES
Int16Array.constructor	YES	YES	YES	YES
Int32Array.constructor	YES	YES	YES	YES
Int8Array.constructor	YES	YES	YES	YES
Map.forEach	YES	N/A	YES	YES
Map.clear	YES	N/A	YES	YES
Map.delete	YES	N/A	YES	YES
Map.get	YES	N/A	YES	YES
Map.has	YES	N/A	YES	YES
Map.set	YES	N/A	YES	YES
Map.keys	YES	N/A	YES	YES
Map.values	YES	N/A	YES	YES
Map.entries	YES	N/A	YES	YES
Map.constructor	YES	N/A	YES	YES
Math.abs	YES	YES	YES	YES
Math.acos	YES	YES	YES	YES
Math.asin	YES	YES	YES	YES
Math.atan	YES	YES	YES	YES
Math.acosh	YES	N/A	YES	YES
Math.asinh	YES	N/A	YES	YES
Math.atanh	YES	N/A	YES	YES
Math.atan2	YES	YES	YES	YES
Math.cbrt	YES	N/A	YES	YES
Math.ceil	YES	YES	YES	YES
Math.clz32	YES	N/A	YES	YES
Math.cos	YES	YES	YES	YES
Math.cosh	YES	N/A	YES	YES
Math.exp	YES	YES	YES	YES
Math.expm1	YES	N/A	YES	YES
Math.floor	YES	YES	YES	YES
Math.fround	YES	N/A	YES	YES
Math.hypot	YES	N/A	YES	YES
Math.log	YES	YES	YES	YES
Math.log10	YES	N/A	YES	YES
Math.log1p	YES	N/A	YES	YES
Math.log2	YES	N/A	YES	YES
Math.max	YES	YES	YES	YES
Math.min	YES	YES	YES	YES
Math.pow	YES	YES	YES	YES
Math.random	YES	YES	YES	YES
Math.round	YES	YES	YES	YES
Math.sign	YES	N/A	YES	YES
Math.sin	YES	YES	YES	YES
Math.sinh	YES	N/A	YES	YES
Math.sqrt	YES	YES	YES	YES
Math.tan	YES	YES	YES	YES
Math.tanh	YES	N/A	YES	YES
Math.trunc	YES	N/A	YES	YES
Math.imul	YES	YES	YES	YES
Object.toString	YES	YES	YES	YES
Object.toLocaleString	YES	YES	YES	YES
Object.valueOf	YES	YES	YES	YES
Object.hasOwnProperty	YES	YES	YES	YES
Object.propertyIsEnumerable	YES	YES	YES	YES
Object.isPrototypeOf	YES	YES	YES	YES
Object._defineGetter_	YES	YES	YES	YES
Object._defineSetter_	YES	YES	YES	YES
Object._lookupGetter_	YES	YES	YES	YES
Object._lookupSetter_	YES	YES	YES	YES
Object.constructor	YES	YES	YES	YES
Promise.then	YES	YES	YES	YES
Promise.catch	YES	YES	YES	YES
Promise.constructor	YES	YES	YES	YES
RegExp.compile	YES	YES	YES	YES
RegExp.exec	YES	YES	YES	YES
RegExp.toString	YES	YES	YES	YES
RegExp.test	YES	YES	YES	YES
RegExp.constructor	YES	YES	YES	YES
Set.forEach	YES	N/A	YES	YES
Set.add	YES	N/A	YES	YES
Set.clear	YES	N/A	YES	YES
Set.delete	YES	N/A	YES	YES
Set.has	YES	N/A	YES	YES
Set.entries	YES	N/A	YES	YES
Set.values	YES	N/A	YES	YES
Set.keys	YES	N/A	YES	YES
Set.constructor	YES	N/A	YES	YES
String.match	YES	YES	YES	YES
String.padStart	YES	N/A	N/A	N/A
String.padEnd	YES	N/A	N/A	N/A
String.repeat	YES	N/A	YES	YES
String.replace	YES	YES	YES	YES
String.search	YES	YES	YES	YES
String.split	YES	YES	YES	YES
String.toString	YES	YES	YES	YES
String.valueOf	YES	YES	YES	YES
String.charAt	YES	YES	YES	YES
String.charCodeAt	YES	YES	YES	YES
String.codePointAt	YES	N/A	YES	YES
String.concat	YES	YES	YES	YES
String.indexOf	YES	YES	YES	YES
String.lastIndexOf	YES	YES	YES	YES
String.slice	YES	YES	YES	YES
String.substr	YES	YES	YES	YES
String.substring	YES	YES	YES	YES
String.toLowerCase	YES	YES	YES	YES
String.toUpperCase	YES	YES	YES	YES
String.localeCompare	YES	YES	YES	YES
String.toLocaleLowerCase	YES	YES	YES	YES
String.toLocaleUpperCase	YES	YES	YES	YES
String.big	YES	YES	YES	YES
String.small	YES	YES	YES	YES
String.blink	YES	YES	YES	YES
String.bold	YES	YES	YES	YES
String.fixed	YES	YES	YES	YES
String.italics	YES	YES	YES	YES
String.strike	YES	YES	YES	YES
String.sub	YES	YES	YES	YES
String.sup	YES	YES	YES	YES
String.fontcolor	YES	YES	YES	YES
String.fontsize	YES	YES	YES	YES
String.anchor	YES	YES	YES	YES
String.link	YES	YES	YES	YES
String.trim	YES	YES	YES	YES
String.trimLeft	YES	YES	YES	YES
String.trimRight	YES	YES	YES	YES
String.startsWith	YES	N/A	YES	YES
String.endsWith	YES	N/A	YES	YES
String.includes	YES	N/A	YES	YES
String.normalize	YES	YES	YES	YES
String.constructor	YES	YES	YES	YES
Symbol.toString	YES	N/A	YES	YES
Symbol.valueOf	YES	N/A	N/A	YES
Symbol.constructor	YES	N/A	YES	YES
TypeError.toString	YES	N/A	N/A	YES
TypeError.constructor	YES	YES	YES	YES
Uint16Array.constructor	YES	YES	YES	YES
Uint32Array.constructor	YES	YES	YES	YES
Uint8Array.constructor	YES	YES	YES	YES
Uint8ClampedArray.constructor	YES	YES	YES	YES
WeakMap.delete	YES	YES	YES	YES
WeakMap.get	YES	YES	YES	YES
WeakMap.has	YES	YES	YES	YES
WeakMap.set	YES	YES	YES	YES
WeakMap.constructor	YES	YES	YES	YES

目前平台数据还不全，比如 Android 5.0 就没有相应的数据。愿意贡献数据的同学请发信给我，只要打开一个微信小程序，点个按钮即可。

License

kamidox/minapp-polyfill

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