Class 与 Style 绑定 — Vue.js
https://cn.vuejs.org/v2/guide/class-and-style.html
<!DOCTYPE html> <html> <head> <meta charset="UTF-8" /> <title></title> <script src="vue.js"></script> <style> .red { color: red; } .fontBig { font-size: larger; } </style> </head> <body> <div id="vueApp"> <div :class="{red:isRed}" @click="clickDiv1"> class绑定对象写法 :class="{类名1:真假,类名2：真假}" </div> <div :class="[{red:isRed},fontClassName]" @click="clickDiv2"> class绑定数组写法 :class="[对象,class名变量]" </div> <div :style="{fontSize:fontSizeName,color:colorName}" @click="clickDiv3"> style绑定对象写法 :style="JS对象" </div> <div :style="[baseStyleObj,colorStyleObj]"> style绑定数组写法 :style="[JS对象1,JS对象2]" </div> </div> </body> <script> //初始化VUE页面 var vm = new Vue({ el: "#vueApp", data: { isRed: false, fontClassName: "fontBig", colorName: "black", fontSizeName: "small", baseStyleObj: { fontSize: "small", }, colorStyleObj: { color: "red", } }, watch: { fontSizeName: function (val) { this.baseStyleObj.fontSize = this.fontSizeName; }, colorName: function (val) { this.colorStyleObj.color = this.colorName; } }, methods: { clickDiv1: function () { this.isRed = !this.isRed; }, clickDiv2: function () { this.isRed = !this.isRed; }, clickDiv3: function () { if (this.colorName === "black") { this.colorName = "red"; } else { this.colorName = "black"; } if (this.fontSizeName === "small") { this.fontSizeName = "larger"; } else { this.fontSizeName = "small"; } } } }); </script> </html>
原文：https://www.cnblogs.com/chang-an/p/12329185.html