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es6 new features
The new features of es6 include: 1. Block-level scope variables; 2. Arrow functions; 3. Template strings; 4. Destructuring assignment; 5. Default parameters; 6. Extension operator; 7. Classes and inheritance; 8. Promise. This topic provides you with articles, downloads, and course content related to the new features of es6 for everyone to download and experience for free.
What are the new features of es6?The new features of es6 are: 1. let and const; 2. symbol; 3. template string; 4. destructuring expressions; 5. objects, such as Map and Set; 6. functions, such as parameter default values and arrow functions; 7. Class keyword; 8. Promise and proxy; 9. Modularization; 10. Operators.
What are the new features of es6New features of es6: const and let variables, template literals, destructuring, enhanced object literals, for...of loops, expansion operators (...), remaining parameters (variable parameters), ES6 arrow functions, classes Support, string templates, iterators, generators, modules, Symbols, etc.
Do all browsers now support es6?No; ES6 provides many new features, but not all browsers can perfectly support it. For example, IE7~11 versions basically do not support ES6, and Edge12-14 only supports some of the new ES6 features; the most friendly to ES6 new features is Chrome and Firefox browsers can support 97% of ES6 new features starting from version 51 of Chrome, and 97% of new ES6 features starting from version 53 of Firefox.
Why does the mini program need to convert es6 to es5?For browser compatibility. As a new specification for JS, ES6 adds a lot of new syntax and API. However, modern browsers do not have high support for the new features of ES6, so ES6 code needs to be converted to ES5 code. In the WeChat web developer tools, babel is used by default to convert the developer's ES6 syntax code into ES5 code that is well supported by all three terminals, helping developers solve development problems caused by different environments; only in the project Just configure and check the "ES6 to ES5" option.
Why convert es6 to es5Reason: For browser compatibility and to run the application smoothly in the node.js environment. As a new specification for JS, ES6 adds a lot of new syntax and API, but modern browsers do not have high support for the new features of ES6, so it is necessary to convert ES6 code to ES5 code; you only need to install and configure the Babel tool in the project That’s it.
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