PriceSelling未定義。但是，它是

Question

我得到錯誤PriceSelling未定義。但事實上，我知道它在頁面上，因爲它將它記錄在控制檯中。請幫忙！謝謝

$.get(window.location, function(data){ 
    var regex=/<span class="it " data-se="item-privatesale-price">([\d,]+)<\/span>/; 
    var PriceSelling = data.match(regex)[1]; 
    console.log(PriceSelling); 
}); 

function get(name){ 
    if(name=(new RegExp('[?&]'+encodeURIComponent(name)+'=([^&]*)')).exec(location.search)) 
     return decodeURIComponent(name[1]); 
} 

if (get('bot') && get('expecting') && get('expecting') == PriceSelling) { 
console.log("It's a go!"); 
document.getElementsByClassName('conf-buy-now btn-primary btn-medium PurchaseButton ')[0].click(); 
//document.getElementById('conf-confirm-btn').click(); 
}; 

Answer 1

它被定義在傳遞給$.get的回調函數的範圍內。

但它沒有在全球範圍內定義。

你可以做

var PriceSelling; 

$.get(window.location, function(data){ 
    var regex=/<span class="it " data-se="item-privatesale-price">([\d,]+)<\/span>/; 
    PriceSelling = data.match(regex)[1]; 
    console.log(PriceSelling); 
}); 

function get(name){ 
    if(name=(new RegExp('[?&]'+encodeURIComponent(name)+'=([^&]*)')).exec(location.search)) 
    return decodeURIComponent(name[1]); 
} 

if (get('bot') && get('expecting') && get('expecting') == PriceSelling) { 
    console.log("It's a go!"); 
    document.getElementsByClassName('conf-buy-now btn-primary btn-medium PurchaseButton ')[0].click(); 
    //document.getElementById('conf-confirm-btn').click(); 
} 

，但同時你也不會得到ReferenceError，它不會有太大的好，因爲PriceSelling將永遠是undefined。

但我注意到您正嘗試立即使用該響應。你必須在回調中使用它，一旦收到響應就會調用它。

您可能會受益於How do I return the response from an asynchronous call?。

$.get(window.location, function(data){ 
    var regex=/<span class="it " data-se="item-privatesale-price">([\d,]+)<\/span>/; 
    var PriceSelling = data.match(regex)[1]; 
    console.log(PriceSelling); 

    function get(name){ 
    if(name=(new RegExp('[?&]'+encodeURIComponent(name)+'=([^&]*)')).exec(location.search)) 
     return decodeURIComponent(name[1]); 
    } 

    if (get('bot') && get('expecting') && get('expecting') == PriceSelling) { 
    console.log("It's a go!"); 
    document.getElementsByClassName('conf-buy-now btn-primary btn-medium PurchaseButton ')[0].click(); 
    //document.getElementById('conf-confirm-btn').click(); 
    } 
});