if 如果

if

类型: MethodDeclaration

所属类: CommandFunctionList

定义位置: command.ts

描述

如果

参数

参数名	类型	描述	默认值
\{ branches, elseCommands, \}	{

	branches: Array<any>;
	elseCommands?: [`CommandDataList`](https://github.com/Open-Yami-Community/open-yami-doc/blob/main/i18n/zh/docusaurus-plugin-content-docs/current/script/yami/yami.command.d.ts#L8);
} | - | - |

返回值

类型: CommandFunction

源代码

位置: 第 2997 行

protected if({
		branches,
		elseCommands,
	}: {
		branches: Array<any>;
		elseCommands?: CommandDataList;
	}): CommandFunction {
		const { commands, index } = this.stack.get();
		const pop = Command.goto(commands, index + 1);
		const length = branches.length;
		const testers = new Array(length);
		const functions = new Array(length);
		for (let i = 0; i < length; i++) {
			const { mode, conditions, commands } = branches[i];
			testers[i] = Command.compileConditions(mode, conditions);
			functions[i] = Command.goto(Command.compile(commands, pop), 0);
		}
		const elseFn =
			elseCommands !== undefined
				? Command.goto(Command.compile(elseCommands, pop), 0)
				: Command.skip;
		if (length < 6) {
			const [a, b, c, d, e] = testers;
			const [f, g, h, i, j] = functions;
			switch (length) {
				case 1:
					return () => (a() ? f : elseFn)();
				case 2:
					return () => (a() ? f : b() ? g : elseFn)();
				case 3:
					return () => (a() ? f : b() ? g : c() ? h : elseFn)();
				case 4:
					return () => (a() ? f : b() ? g : c() ? h : d() ? i : elseFn)();
				case 5:
					return () =>
						(a() ? f : b() ? g : c() ? h : d() ? i : e() ? j : elseFn)();
			}
		}
		return () => {
			for (let i = 0; i < length; i++) {
				if (testers[i]()) {
					return functions[i]();
				}
			}
			return elseFn();
		};
	}

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文档生成时间：2026/2/1 16:51:39