我有一個簡單的javascript代碼。但它沒有像我預期的那樣工作。我想從javascript對象中提取數(shù)據(jù)，但是每當我執(zhí)行該函數(shù)時，即使我對原始數(shù)組未執(zhí)行任何操作，原始對象數(shù)組也會更改。是對象數(shù)組結(jié)構(gòu)的問題嗎？還是異步問題？<!DOCTYPE html><html><head> <title></title></head><body> <button onclick="test()"> </button></body><script type="text/javascript"> var testArray = [];var num1 = 0; var allorderDemo = [ { name:'test1', orders: [ {name: 'fanta', num:1}, {name: 'cola', num:2}, {name: 'sweet', num:1} ] }, { name:'test2', orders: [ {name: 'fanta', num:1}, {name: 'cola', num:2}, {name: 'sweet', num:1} ] }, { name:'test3', orders: [ {name: 'fanta', num:1}, {name: 'cola', num:2}, {name: 'ox', num:1} ] } ]; function test(){ testArray = []; for(var i = 0; i < allorderDemo.length; i++){ for(var j = 0; j < allorderDemo[i].orders.length; j++){ var index = testArray.findIndex(function(element) { return (element.name == allorderDemo[i].orders[j].name); }); console.log("index",index); if(index > 0) testArray[index].num += allorderDemo[i].orders[j].num; else testArray.push(allorderDemo[i].orders[j]); } } console.log(allorderDemo.length); console.log(testArray); console.log(allorderDemo); }</script></html> 我想從allorderdemo中提取testarray。但是每當我執(zhí)行測試函數(shù)時.log控制臺.log說原始數(shù)組allorderdemo會發(fā)生變化，因為我不會在函數(shù)中更改它。為什么會發(fā)生此錯誤。請幫幫我。
當我使用幾個 for （） 函數(shù)循環(huán)訪問數(shù)組時，為什么原始數(shù)組會發(fā)生變化
慕絲7291255
2022-09-02 16:29:43
