vue hello world项目
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/**
* @license
* Copyright (c) 2016, Contributors
* SPDX-License-Identifier: ISC
*/
export function camelCase(str) {
// Handle the case where an argument is provided as camel case, e.g., fooBar.
// by ensuring that the string isn't already mixed case:
const isCamelCase = str !== str.toLowerCase() && str !== str.toUpperCase();
if (!isCamelCase) {
str = str.toLowerCase();
}
if (str.indexOf('-') === -1 && str.indexOf('_') === -1) {
return str;
}
else {
let camelcase = '';
let nextChrUpper = false;
const leadingHyphens = str.match(/^-+/);
for (let i = leadingHyphens ? leadingHyphens[0].length : 0; i < str.length; i++) {
let chr = str.charAt(i);
if (nextChrUpper) {
nextChrUpper = false;
chr = chr.toUpperCase();
}
if (i !== 0 && (chr === '-' || chr === '_')) {
nextChrUpper = true;
}
else if (chr !== '-' && chr !== '_') {
camelcase += chr;
}
}
return camelcase;
}
}
export function decamelize(str, joinString) {
const lowercase = str.toLowerCase();
joinString = joinString || '-';
let notCamelcase = '';
for (let i = 0; i < str.length; i++) {
const chrLower = lowercase.charAt(i);
const chrString = str.charAt(i);
if (chrLower !== chrString && i > 0) {
notCamelcase += `${joinString}${lowercase.charAt(i)}`;
}
else {
notCamelcase += chrString;
}
}
return notCamelcase;
}
export function looksLikeNumber(x) {
if (x === null || x === undefined)
return false;
// if loaded from config, may already be a number.
if (typeof x === 'number')
return true;
// hexadecimal.
if (/^0x[0-9a-f]+$/i.test(x))
return true;
// don't treat 0123 as a number; as it drops the leading '0'.
if (/^0[^.]/.test(x))
return false;
return /^[-]?(?:\d+(?:\.\d*)?|\.\d+)(e[-+]?\d+)?$/.test(x);
}