#[wasm_bindgen] pub fn dot(input: Vec, mul: f32) -> Vec{ let mut output: Vec = vec![]; for item in input { output.push(item * mul); } output } 将rust编写的函数导出为wasm, wasm-bindgen工具自动生成类似的胶水函数 /** * @param {Float32Array} input * @param {number} mul * @returns {Float32Array} */ export function dot(input, mul) { try { const retptr = wasm.__wbindgen_add_to_stack_pointer(-16); const ptr0 = passArrayF32ToWasm0(input, wasm.__wbindgen_malloc); const len0 = WASM_VECTOR_LEN; wasm.dot(retptr, ptr0, len0, mul); var r0 = getInt32Memory0()[retptr / 4 + 0]; var r1 = getInt32Memory0()[retptr / 4 + 1]; var v2 = getArrayF32FromWasm0(r0, r1).slice(); wasm.__wbindgen_free(r0, r1 * 4); return v2; } finally { wasm.__wbindgen_add_to_stack_pointer(16); } } 其中处理函数输入输出使用类似的代码片段 function passArrayF32ToWasm0(arg, malloc) { const ptr = malloc(arg.length * 4, 4) >>> 0; getFloat32Memory0().set(arg, ptr / 4); WASM_VECTOR_LEN = arg.length; return ptr; } 以类似的方法在js中调用dot函数 let input = new Float32Array(10000) .fill(1); console.log(input.length); let output = dot(input, 2); console.log(output.length); 期望输出为input.length == output.length 实际上输出为input.length == 10000 output.length == 2232 且返回数据是错误的计算结果， 经过测试输入数组长度最高为8177 约等于 64 * 128，超过这个长度，输出的数据就是错误的 在`passArrayF32ToWasm0`函数中也存在错误 let cachedFloat32Memory0 = null; function getFloat32Memory0() { if (cachedFloat32Memory0 === null || cachedFloat32Memory0.byteLength === 0) { cachedFloat32Memory0 = new Float32Array(wasm.memory.buffer); } return cachedFloat32Memory0; } function passArrayF32ToWasm0(arg, malloc) { const ptr = malloc(arg.length * 4, 4) >>> 0; // 在malloc之后，期望 cachedFloat32Memory0.byteLength==0 // 实际上此时的cachedFloat32Memory0.byteLength会保持为一个旧值，但是 // wasm.memory.buffer.byteLength已经grow到了新的值 getFloat32Memory0().set(arg, ptr / 4); WASM_VECTOR_LEN = arg.length; return ptr; }