初始化（包含登录模块）

wxcomponents/vant/button/index.js

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+import { VantComponent } from '../common/component';
+import { button } from '../mixins/button';
+import { openType } from '../mixins/open-type';
+VantComponent({
+    mixins: [button, openType],
+    classes: ['hover-class', 'loading-class'],
+    data: {
+        style: ''
+    },
+    props: {
+        icon: String,
+        plain: Boolean,
+        block: Boolean,
+        round: Boolean,
+        square: Boolean,
+        loading: Boolean,
+        hairline: Boolean,
+        disabled: Boolean,
+        loadingText: String,
+        customStyle: String,
+        loadingType: {
+            type: String,
+            value: 'circular'
+        },
+        type: {
+            type: String,
+            value: 'default'
+        },
+        size: {
+            type: String,
+            value: 'normal'
+        },
+        loadingSize: {
+            type: String,
+            value: '20px'
+        },
+        color: {
+            type: String,
+            observer(color) {
+                let style = '';
+                if (color) {
+                    style += `color: ${this.data.plain ? color : 'white'};`;
+                    if (!this.data.plain) {
+                        // Use background instead of backgroundColor to make linear-gradient work
+                        style += `background: ${color};`;
+                    }
+                    // hide border when color is linear-gradient
+                    if (color.indexOf('gradient') !== -1) {
+                        style += 'border: 0;';
+                    }
+                    else {
+                        style += `border-color: ${color};`;
+                    }
+                }
+                if (style !== this.data.style) {
+                    this.setData({ style });
+                }
+            }
+        }
+    },
+    methods: {
+        onClick() {
+            if (!this.data.disabled && !this.data.loading) {
+                this.$emit('click');
+            }
+        }
+    }
+});