81 lines
1.9 KiB
TypeScript
81 lines
1.9 KiB
TypeScript
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///<summary>获得字符串实际长度，中文2，英文1</summary>
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///<param name="str">要获得长度的字符串</param>
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export const getStrLength = function (str: string) {
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var realLength = 0,
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len = str.length,
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charCode = -1;
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for (var i = 0; i < len; i++) {
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charCode = str.charCodeAt(i);
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if (charCode >= 0 && charCode <= 128) realLength += 1;
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else realLength += 2;
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}
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return realLength;
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};
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//js截取字符串，中英文都能用
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//如果给定的字符串大于指定长度，截取指定长度返回，否者返回源字符串。
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//字符串，长度
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/**
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* js截取字符串，中英文都能用
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* @param str：需要截取的字符串
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* @param len: 需要截取的长度
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*/
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export const cutStr = function cutstr(str: string, len: number) {
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var str_length = 0;
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var str_len = 0;
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let str_cut = new String();
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str_len = str.length;
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for (var i = 0; i < str_len; i++) {
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let a = str.charAt(i);
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str_length++;
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if (escape(a).length > 4) {
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//中文字符的长度经编码之后大于4
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str_length++;
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}
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str_cut = str_cut.concat(a);
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if (str_length >= len) {
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str_cut = str_cut.concat('...');
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return str_cut;
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}
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}
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//如果给定字符串小于指定长度，则返回源字符串；
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if (str_length < len) {
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return str;
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}
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};
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/**
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* 查看字符串是否为可访问链接
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* @param str 待检查链接
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* @returns
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*/
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export const isUrl = (str: string) => {
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try {
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new URL(str);
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return true;
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} catch (err) {
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return false;
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}
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}
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/**
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* 通过url获取值
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* @param key 想要获取的值
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* @param url 需要截取的链接
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*/
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export const getValueByUrl = (key: string, str: string) => {
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let result = null
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if (isUrl(str)) {
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result = new URL(str).searchParams.get(key)
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} else {
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result = new URLSearchParams(str.indexOf('?') > -1 ? str : `?${str}`).get(key)
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}
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return result
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}
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