number,isNaN(),Number(),parseInt(),parseFloat() number:表示整数和浮点数 如何与NaN的操作都会返回NaN,与任何值都不相等,包括本身。 isNaN(n),检测n是否是“非数值”,返回值是boolean parseInt():会忽略字符串前面的空格,直到找到第一个非空格字符。 console.log(parseInt("0xf",16)); toString和String(...
type: String, default: '' }, btnText: { type: String, default: '展开' }, ellipsisText: { type: String, default: '...' }, rows: { type: Number, default: 6 }, btnShow: { type: Boolean, default: false }, }, data () { return { textLength: 0, beforeRefresh: null } }, ...
ThepadEnd()method is a string method. To pad a number, convert the number to a string first. See the example below. Example letnumb =5; lettext = numb.toString(); letpadded = text.padEnd(4,"0"); Try it Yourself » Syntax ...
number:表示整数和浮点数 如何与NaN的操作都会返回NaN,与任何值都不相等,包括本身。 isNaN(n),检测n是否是“非数值”,返回值是boolean parseInt():会忽略字符串前面的空格,直到找到第一个非空格字符。 代码语言:javascript 代码运行次数:0 运行 AI代码解释 console.log(parseInt("0xf",16)); toString和String(...
To pad a number, convert the number to a string first. See the example below. Example letnumb =5; lettext = numb.toString(); letpadded = text.padStart(4,"0"); Try it Yourself » Browser Support padStart()is anECMAScript 2017feature. ...
viewport string | object { selector: 'body', padding: 0 } Keeps the tooltip within the bounds of this element. Example: viewport: '#viewport' or { "selector": "#viewport", "padding": 0 } Data attributes for individual tooltips Options for individual tooltips can alternatively be specified...
0 number false boolean "" string null object/null undefined undefined NaN number NaN :Not a Number number类型 一般在非法运算的时候才会 出现NaN isNaN(参数) 非常讨厌数字 首先尽量把参数转换成数字,然后 当参数是 数字,返回 false 当参数不是数字,返回 true ...
offset number 10 Pixels to offset from top when calculating position of scroll. Events Event TypeDescription activate.bs.scrollspy This event fires whenever a new item becomes activated by the scrollspy. $('#myScrollspy').on('activate.bs.scrollspy', function () { // do something… }) Togglab...
delay number | object 0 Delay showing and hiding the tooltip (ms) - does not apply to manual trigger type If a number is supplied, delay is applied to both hide/show Object structure is: delay: { "show": 500, "hide": 100 } html boolean false Insert HTML into the tooltip. If false...
基本数据类型:由简单的结构组成的数字(number),字符串(string),布尔(boolean),null,undefined 引用数据类型:结构相对复杂一些的对象数据类型(object),函数数据类型(function)。对象数据类型如 [],{},/^$/ 基本数据类型和引用数据类型的区别 基本数据类型是把值直接给变量,在接下来的操作中,两个值不影响 引用数据...