How to build a single-page web application using C++?
Building SPA using C++ involves: 1. Installing Emscripten and configuring the compiler; 2. Running the build script to compile the code; 3. Creating an HTML interface containing the WASM module; 4. Deploying the SPA to the web server.
Building a single-page web application using C++
A single-page web application (SPA) is a dynamic and interactive A web application that renders content on the client side after loading a single HTML page. C++ is primarily used for creating backend applications, but it can also run in a web browser via WebAssembly (WASM).
Steps
- Install Emscripten: Emscripten is a compiler toolchain that compiles C++ code to WASM. Install Emscripten and set environment variables.
- Configure the build system: Use CMake or other build systems to create build scripts. Set Emscripten compiler as target.
- Run the build: Run the build script to compile the C++ code into WASM and HTML files.
- Create HTML file: The HTML file should load the WASM module and provide the interface. For example:
<!DOCTYPE html>
<html>
<body>
<div id="output"></div>
<script>
// 加载WASM模块
let instance = null;
(async () => {
instance = await WebAssembly.instantiateStreaming(fetch('app.wasm'));
})();
// 调用WASM函数
const result = instance.exports.computeFibonacci(10);
// 将结果显示在界面上
document.getElementById('output').innerHTML = result;
</script>
</body>
</html>- Deploy SPA: Deploy the HTML file and WASM module to the web server.
Practical case
Consider a SPA that calculates the Fibonacci sequence. The following C++ code can be used:
// 计算斐波那契数列
long long int fib(int n) {
if (n <= 1) {
return n;
} else {
return fib(n - 1) + fib(n - 2);
}
}Compile this code via Emscripten and create a SPA using the above HTML file. When this SPA is loaded, the user can enter a number and the SPA will calculate and display the corresponding Fibonacci number using the WASM function.
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