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JavaScript Promise – Uncaught (in promise)

I'm learning about JavaScript's Promise function and I expect to run the following in sequence: Do_System_Refresh(); --> In this function, I call the AJAX function within System_Refresh() for some purposes. Do_Refresh_UI(); I tried the following, but I encountered an exception:…

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How to change CSS property inside a descendant selector

How do I change or remove style "width" property for img? .main_box_img img { width: 100%; } <div class="main_box_img"> <img src="..."> </div> document.getElementsByClassName("main_box_img")[0].getElementsByTagName('img')[0].style is empty. I can get width value using getComputedStyle(), but it's read-only. Seems to be a simple…

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How to compare two big number in javascript

Why below code output result is equal? How to compare? var num1 = 340282000000000000000000000000000000001 var num2 = 340282000000000000000000000000000000000 // 3.402823E+38 if(num1 == num2) { console.log('num1 equal to num2'); } else if(num1 > num2) { console.log('num1 bigger than num2'); } else…

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