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使用定义-证据-结论结构_定义-证据-结论：三步构建高效论述框架
1、原生JavaScript实现字符串长度截取 function cutstr(str, len) ","dist_request_id":"1773840456333_26868","ab_strategy":"top3askv3","index":"15","strategy":"2~default~OPENSEARCH~Rate"}" data-report-view="{"spm":"3001.5635","dest":"https://blog.csdn.net/CodeWhim/article/details/154176708","mod":"popu_889","extra":"{"utm_medium":"distribute.pc_relevant_ask_down.none-task-blog-2~default~OPENSEARCH~Rate-15-154176708-ask-9388299.259^v1^pc_feed_download_top3ask","dist_request_id":"1773840456333_26868"}","dist_request_id":"1773840456333_26868","ab_strategy":"top3askv3","index":"15","strategy":"2~default~OPENSEARCH~Rate"}" data-report-query="spm=3001.5635&utm_medium=distribute.pc_relevant_ask_down.none-task-blog-2~default~OPENSEARCH~Rate-15-154176708-ask-9388299.259^v1^pc_feed_download_top3ask&depth_1-utm_source=distribute.pc_relevant_ask_down.none-task-blog-2~default~OPENSEARCH~Rate-15-154176708-ask-9388299.259^v1^pc_feed_download_top3ask" class="7737-3170-2572-4473 question_a" data-v-f632b874>isEmpty()过时了？深入解析String.isBlank()的真正优势
