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一文带你掌握JavaScript中的箭头函数_javascript技巧_脚本之家
const getUserNames = users.map(({ name }) => name); console.log(getUserNames);// 输出:['Alice', 'Bob', 'Charlie'] // 数组解构 const points = [ [1, 2], [3, 4], [5, 6], ]; const getDistancesFromOrigin = points.map(([x, y]) => Math.sqrt(x * x + y * y)); ...
www.jb51.net/article/2839...htm 2024-6-1
python基础篇之pandas常用基本函数汇总_python_脚本之家
逻辑替换包括了where和mask,这两个函数是完全对称的:where函数在传入条件为False的对应行进行替换,而mask在传入条件为True的对应行进行替换,当不指定替换值时,替换为缺失值(NAN) s = pd.Series([-1, 1.2345, 100, -50]) s.where(s<0) 0 -1.0 1 NaN 2 NaN 3 -50.0 dtype: float64 s.where(s<0, ...
www.jb51.net/article/254126.htm 2024-5-29
JavaScript箭头函数中的this详解_javascript技巧_脚本之家
A function's this keyword behaves a little differently in JavaScript compared to other languages. It also has some differences between strict mode and non-strict mode. JavaScript是一门比较奇特的语言,它的this与其他语言不一样,并且它的取值还取决于代码是否为严格模式("use strict")。
www.jb51.net/article/1633...htm 2024-6-2
深入理解JavaScript内置函数_基础知识_脚本之家
s += d.getYear(); return(s); } (2)getDay函数:返回星期几,值为0~6,其中0表示星期日,1表示星期一,...,6表示星期六。例:1 2 3 4 5 6 7 8 9 10 function DateDemo() { var d, day, x, s = "Today is: "; var x = new Array("Sunday", "Monday", "Tuesday"); var x = x...
www.jb51.net/article/858...htm 2024-6-2
JS开发常用工具函数(小结)_javascript技巧_脚本之家
s = date.getSeconds(); return formater.replace(/YYYY|yyyy/g,Y) .replace(/YY|yy/g,Y.substr(2,2)) .replace(/MM/g,(M<10?'0':'') + M) .replace(/DD/g,(D<10?'0':'') + D) .replace(/HH|hh/g,(H<10?'0':'') + H) .replace(/mm/g,(m<10?'0':'') + m) .rep...
www.jb51.net/article/1646...htm 2024-6-2