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javascript - 不懂这个JS

转载 作者:行者123 更新时间:2023-11-30 10:50:09 24 4
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function decimalToHex(d, padding) {

var hex = Number(d).toString(16);
/*I dont understand this part: does this mean if padding gets a value = "undefined". It'd be equal to "justchecking" in this case.
What is a value of "undefined" then? is it really necessary this if-statement? */
padding = typeof (padding) === "undefined" || padding === null ? padding = "justchecking" : padding;

while (hex.length < padding) {
hex = "0" + hex;
}

return hex;
}

感谢您的解释...

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