h5 nickname micro-channel format reserved word first, with the remaining display *

Taken micro-channel should be noted that the nickname, emoticons and special characters, if you do not have a regular filter out, use slice (0,1) is directly first string is not taken, because the emoticon occupies 2 bytes. interception half, ios will complain, android may be garbled, these are not what we want!

ES6 provided to us in a way Array.from ()

Array.from () method is to convert an array of objects of a class comparable cases or objects into a real array.

Class array of objects: The most basic requirement is that the object has a length property.

Used here it is: convert a string to an array of this method

let str = "Hello";

console.log(Arry.from(str));  // ["H","e","l","l","o"];

formatName(value, num) {
      if (!value) return ''
      value = value.replace(/(^\s+)|(\s+$)/g, "").replace(/\'/g,"‘").replace(/\"/g,"“");
      var s = '';
      var strLength = this.getStrLength(value);
      for (var i = 0; i < strLength - 1; i++) {
           if(i>=6) break;
           s += '*';
       }
      return this.truncated(value, num) + s;
},
truncated(str, num){
      return Array.from(str).slice(0, num).join('');
},
getStrLength(str){
     return Array.from(str).length;
},

Extending a form submission time, the filter expression method emoji

js检测输入框是否含有emoji表情（移动端比较常见）
var param = document.getElementById(id).value; 
var regRule = /\uD83C[\uDF00-\uDFFF]|\uD83D[\uDC00-\uDE4F]/g; 
if(param.match(regRule)) { 
    param = param.replace(/\uD83C[\uDF00-\uDFFF]|\uD83D[\uDC00-\uDE4F]/g, “”); 
    alert(“不支持表情”); 
}

PHP后端代码
function have_emoji($str){
    $mat = [];
    preg_match_all('/./u', $str,$mat);
    foreach ($mat[0] as $v){
        if(strlen($v) > 3){return true;}
    }
    return false;
}