<！doctype html> <html> <head> <meta http-equiv = "content-type" content = "text/html; charset = utf-8"/> <title>每天一个javascript window.onload = function（）{var height = getheight（）; console.log（height）; }関数getheight（）{var height = 0; var div = document.getElementById（ "date"）。getBoundingClientRect（）; if（div.height）{height = div.height; } else {height = div.bottom -div.top; } return height; } </script> </head> <body> <div> <div id = "date"> </div> </div> </body> </html>