How to use pure JS code to determine how many Chinese characters there are in a string-JS Tutorial-php.cn

How to use pure JS code to determine how many Chinese characters there are in a string

高洛峰

Release： 2016-12-07 10:07:36

Original

1356 people have browsed it

In website development, js code is often simply used to determine how many Chinese characters are in a string. Today I take the time to share with you the implementation code. Without further ado, I will just post the code for you.

$("form").submit(function () {
var content = editor.getContentTxt();
var sum = 0;
re = /[\u4E00-\u9FA5]/g; //测试中文字符的正则
if (content) {
if (re.test(content)) //使用正则判断是否存在中文
{
if (content.match(re).length <= 10) { //返回中文的个数
$.dialog.tips("帖子正文不能小于10个汉字！");
return false;
}
else {
var $submit = $("input[type=&#39;submit&#39;]").attr("disabled", true);
setTimeout(function () { $submit.attr("disabled", false) }, 5000);
return true;
}
}
else {
$.dialog.tips("帖子正文不能小于10个汉字！");
return false;
}
}
else {
$.dialog.tips("帖子正文不能小于10个汉字！");
return false;
}
});

Copy after login

Okay, the above code is the implementation method of js to determine how many Chinese characters there are in a string.

ps: JS determines the length of the input string (Chinese characters count as two characters, alphanumeric characters count as one)

Chinese characters occupy 2 characters in the database. If the input characters exceed the length of the database table field, an error will occur, so it needs to be in the foreground Make judgments. There are two ways to judge:

Method 1: Use regular expressions, the code is as follows:

function getByteLen(val) {
var len = 0;
for (var i = 0; i < val.length; i++) {
var a = val.charAt(i);
if (a.match(/[^\x00-\xff]/ig) != null)
{
len += 2;
}
else
{
len += 1;
}
}
return len;
}

Copy after login

Method 2: Use character unicode to judge: The method is as follows:

function getByteLen(val) {
var len = 0;
for (var i = 0; i < val.length; i++) {
var length = val.charCodeAt(i);
if(length>=0&&length<=128)
{
len += 1;
}
else
{
len += 2;
}
}
return len;
}

Copy after login