ES6参数默认值

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方式一:

function makeAjaxRequest(url,method){
    if(!method){//在METHOD没有值的情况下为GET
        method = "GET";
    }
    return method;//GET
}

方式二:\

function makeAjaxRequest(url,method = "get"){
    
    return method;//post,在没传值的情况下为get,
}
console.log(makeAjaxRequest('google.com'));
console.log(makeAjaxRequest('google.com',"POST"));