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promise chain 传参

来源:图艺博知识网

Promise.resolve("init_arg").then(a1=>{
    console.log('run 1 with:',a1);

    return Promise.resolve("hi,2!");
    
}).then(a21 => {
    console.log('run 2 with:',a21);
    console.log(a21);
})

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