Number+roundToTwoDecimalPlaces() : numberJavaScript 以上类图表示了一个名为Number的类,该类包含了一个名为value的私有属性和两个公共方法toString()和roundToTwoDecimalPlaces()。这些方法可用于将数字转换为字符串和保留2位小数。
constnum=5.3281;constresult=num.toFixed(2);console.log(result);// 5.33console.log(typeofresult);// string 但是,我们总是可以使用 Number() 构造函数将结果转换为数字: 代码语言:javascript 代码运行次数:0 运行 AI代码解释 constnum=5.3281;constresult=Number(num.toFixed(2));console.log(result);// ...
NOTE – toFixed(x) function – Always first typecast the given decimal number(float value) into a string. Then round the number to x decimal places. Hence, the data type of result will be a string. You can verify by using thetypeoffunction. ...
为了更好地理解 JavaScript 的数字处理机制,可以通过关系图来展示其结构。以下是一个展示Number类型和其处理的关系的ER图: NumberdoublevaluestringrepresentationOperationstringoperationTypedoubleoperand1doubleoperand2ResultdoublecalculatedValuestringprecisionIssueperformsyields 图解说明 Number包括value和representation属性。 Oper...
For example: const setAmount = console.log;const handleAmount = (value) => { const numberAmount = Number(value); const rounded = Math.round(numberAmount * 1e8) / 1e8; setAmount(rounded);};console.log(handleAmount(10.21231123124124124142));console.log(handleAmount(7.242));console.log(handl...
let number = 456; let text = String(number); console.log(text); // 输出 "456" 使用模板字符串:模板字符串是一种特殊的字符串,可以在其中插入变量。通过将数字作为变量插入模板字符串中,可以将其转换为文本。例如: 代码语言:txt 复制 let number = 789; let text = `${number}`; console.log(te...
JavaScript toFixed() Method We use thetoFixed()method to round off a number into a fixed number of digits. For example, letnum =5.12345; // built-in number method toFixed()// round off num to two decimal placesletroundedNum = num.toFixed(2); ...
floor() 方法向下修正 10.01-- 10 -9.99-- -10 round() 45.6- 46 45.4 -- 45 举例 固定小数位数 function fix(fixNumber, decimalPlaces) { var div = Math.pow(10, decimalPlaces); fixNumber = Math.round(fixNumber * div) / div; return fixNumber; } toFixed(n) 保留n位小数...
You will also learn how to create projects that can easily be done with other platforms, such as creating a wireless security camera with the Pi Zero. Conventions In this book, you will find a number of text styles that distinguish between different kinds of information. Here are some ...
the number will be rounded to, and if necessary, the decimal part will be filled with zeros to make it have the specified length. If the absolute value of numObj is greater than or equal to 1e+21, this method callsNumber.prototype.toString()and returns a string in exponential notation....