package main

import "fmt"

func main() {
	s := "我是中文，标点符号，中文字符截取"
	s2 := []rune(s)
	fmt.Println(len(s), len(s2))
	fmt.Println(string(s2[:4]))
}

contentRune := []rune(article.Content)
if len(contentRune) > 150 {
    contentRune := []rune(article.Content)
    item.Des = string(contentRune[:150])
} else {
    item.Des = article.Content
}