<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>Document</title> <style> .fa{ display: flex; flex-flow: row nowrap; width: 300px; height: 100vh; border: 1px solid #000; } .fa .son1{ /* 注意这里 son1是没有给高度的，但是son1后代demo1给了高度，son1的fa给了高度， 那么，son1的高度完全由fa决定。 */ width: 100px; background: firebrick; } .fa .son1 .demo1{ height: 2000px; width: 50px; background: darkgoldenrod; } </style> </head> <body> <div class="fa"> <div class="son1"> <div class="demo1"></div> </div> </div> </body> </html>
情况2：fa son1都没有给高度 demo1给了高度，最终fa son1的高度由demo1决定
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>Document</title> <style> .fa{ display: flex; flex-flow: row nowrap; width: 300px; /* height: 200px; */ border: 1px solid #000; } .fa .son1{ width: 100px; background: firebrick; } .fa .son1 .demo1{ height: 200px; width: 50px; background: darkgoldenrod; } </style> </head> <body> <div class="fa"> <div class="son1"> <div class="demo1"></div> </div> </div> </body> </html>
