vuetype=number禁止输入e

input type=number 禁止输入字符“e”的办法

输入框input,的type设置为number,本想只输入数字,但是字符“e”却能通过, 首先科普一下, <body> <input onkeypress="getCode(event)" /> </body> <script> function getCode(e){ console.log(e.keyCode); } </script> 每次在输入框输入,我们可以拿到一个event.keyCode,他是一个unicode值

vue 基本知识整理

1 每个Vue.js应用都是通过构造函数Vue创建一个Vue的根实例 2 可以扩展Vue构造器,从而使用预定义选项创建可复用的组件构造器所有的Vue.js组件其实都是被扩展的Vue实例每一个VUE实例都会代理其 data 对象里所有的属性:注意只有这些被代理的属性是响应的,也就是说值的任何改变都会触发视图的重新渲染.如果在实例创建之后添加的属性到实例上,它不会触发视图的更新. vue-resource 在ie9及以下浏览器中,post请求参数无法发送到服务器......bug.... 在我

EditText中禁止输入中文的方法

应用场景在Android应用中有时需要EditText中只允许输入约定的一些字符,禁止输入其他字符.这里列举了一些可能的应用场景. 1. 场景一在通讯录保存好友信息界面中填写好友的电话号码时,应当只能输入数字,禁止输入其他字符. 2. 场景二在登录界面中输入用户名和密码时,由于很多账号系统都不支持中文的用户名和密码,只允许使用英文字母和数字.如果可以禁止在输入框中输入中文可以减少不必要的登录验证过程,也方便了用户操作. 3. 场景三在邮箱地址的输入框中,应当只允许输入英文字母,数字和@.

vue input框type=number 保留两位小数自定义组件

第一步:自定义组件MyNumberInput.vue<template> <input class="numberInput" type="number" :placeholder="placeholder" v-model="inputData" @keydown="keydownFn" /></template><script> export defaul

JavaScript Math和Number对象

目录 1. Math 对象:数学对象,提供对数据的数学计算.如:获取绝对值.向上取整等.无构造函数,无法被初始化,只提供静态属性和方法. 2. Number 对象 :Js中提供数字的对象.包含整数.浮点数等等.并提供数字的类型转换.小数点截取等方法. 1. Math 对象 1.1 介绍 Math 对象,是数学对象,提供对数据的数学计算,如:获取绝对值.向上取整等.无构造函数,无法被初始化,只提供静态属性和方法. 1.2 构造函数无 :Math 对象无构造函数,无法被初始化,只提供静态属性和方法

Harmonic Number(调和级数+欧拉常数)

题意:求f(n)=1/1+1/2+1/3+1/4-1/n (1 ≤ n ≤ 108).,精确到10-8 (原题在文末) 知识点: 调和级数(即f(n))至今没有一个完全正确的公式,但欧拉给出过一个近似公式:(n很大时) f(n)≈ln(n)+C+1/2*n 欧拉常数值:C≈0.57721566490153286060651209 c++ math库中,log即为ln. 题解: 公式:f(n)=ln(n)+C+1/(2*n); n很小时直接求

Java 特定规则排序-LeetCode 179 Largest Number

Given a list of non negative integers, arrange them such that they form the largest number. For example, given [3, 30, 34, 5, 9], the largest formed number is 9534330. Note: The result may be very large, so you need to return a string instead of an i

Eclipse "Unable to install breakpoint due to missing line number attributes..."

Eclipse 无法找到该断点,原因是编译时,字节码改变了,导致eclipse无法读取对应的行了 1.ANT编译的class Eclipse不认,因为eclipse也会编译class.怎么让它们统一呢,就是在build.xml里的javac标签里加上一句debug="true",一切就OK了. 如:<javac ... debug="true"> 链接:http://blog.csdn.net/liu251/article/details/36391

移除HTML5 input在type="number"时的上下小箭头

/*移除HTML5 input在type="number"时的上下小箭头*/ input::-webkit-outer-spin-button, input::-webkit-inner-spin-button{ -webkit-appearance: none; margin:; } input[type="number"]{-moz-appearance:textfield;}

iOS---The maximum number of apps for free development profiles has been reached.

真机调试免费App ID出现的问题The maximum number of apps for free development profiles has been reached.免费应用程序调试最大限度苹果免费App ID只能运行2个应用程序,当调试第三个的时候就会报这个错误,必须把之前的应用程序删除,才能调试新的解决办法:1.连接iPhone 打开Xcode->Window->Devices 2.接着出现这个界面 3.删除其中一个,不是本次运行的应用程序 4.接着会弹框

有理数的稠密性(The rational points are dense on the number axis.)

每一个实数都能用有理数去逼近到任意精确的程度,这就是有理数的稠密性.The rational points are dense on the number axis.

[LeetCode] Minimum Number of Arrows to Burst Balloons 最少数量的箭引爆气球

There are a number of spherical balloons spread in two-dimensional space. For each balloon, provided input is the start and end coordinates of the horizontal diameter. Since it's horizontal, y-coordinates don't matter and hence the x-coordinates of s

[LeetCode] Number of Boomerangs 回旋镖的数量

Given n points in the plane that are all pairwise distinct, a "boomerang" is a tuple of points (i, j, k) such that the distance between i and j equals the distance between i and k (the order of the tuple matters). Find the number of boomerangs.

[LeetCode] Number of Segments in a String 字符串中的分段数量

Count the number of segments in a string, where a segment is defined to be a contiguous sequence of non-space characters. Please note that the string does not contain any non-printable characters. Example: Input: "Hello, my name is John" Output:

[LeetCode] Third Maximum Number 第三大的数

Given a non-empty array of integers, return the third maximum number in this array. If it does not exist, return the maximum number. The time complexity must be in O(n). Example 1: Input: [3, 2, 1] Output: 1 Explanation: The third maximum is 1. Examp

[LeetCode] Convert a Number to Hexadecimal 数字转为十六进制

Given an integer, write an algorithm to convert it to hexadecimal. For negative integer, two’s complement method is used. Note: All letters in hexadecimal (a-f) must be in lowercase. The hexadecimal string must not contain extra leading 0s. If the nu

[LeetCode] Guess Number Higher or Lower II 猜数字大小之二

We are playing the Guess Game. The game is as follows: I pick a number from 1 to n. You have to guess which number I picked. Every time you guess wrong, I'll tell you whether the number I picked is higher or lower. However, when you guess a particula

[LeetCode] Guess Number Higher or Lower 猜数字大小

We are playing the Guess Game. The game is as follows: I pick a number from 1 to n. You have to guess which number I picked. Every time you guess wrong, I'll tell you whether the number is higher or lower. You call a pre-defined API guess(int num) wh

[LeetCode] Number of Connected Components in an Undirected Graph 无向图中的连通区域的个数

Given n nodes labeled from 0 to n - 1 and a list of undirected edges (each edge is a pair of nodes), write a function to find the number of connected components in an undirected graph. Example 1: 0 3 | | 1 --- 2 4 Given n = 5 and

[LeetCode] Create Maximum Number 创建最大数

Given two arrays of length m and n with digits 0-9 representing two numbers. Create the maximum number of length k <= m + n from digits of the two. The relative order of the digits from the same array must be preserved. Return an array of the k digit

vuetype=number禁止输入e

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