一.布局

1.整个屏幕（高度、宽度100%），内容水平和竖直都居中

position: fixed;

height: 100%;width: 100%;

display:flex;flex-direction:column;

align-items:center;/*垂直居中*/

justify-content: center;/*水平居中*/

2.输入框

placeholder="请输入xxx" placeholder-class="placeholder"

二.小程序

1.for循环

<block wx:for="{{answer}}" wx:item="item" wx:key="key"></blcok>

2.给数组加成员

data:{

    answer:["1","2"]

}

let answer = this.data.answer;

answer.push("1");

console.log(answer)

this.setData({

    answer: answer

})

3.给对象增加元素

let answer = this.data.answer;

var obj = new Object();

obj.content='111';

obj.score="30";

console.log(obj)

answer.push(obj);

console.log(answer)       

this.setData({

    answer: answer

})

4.传参数

data-ppid="{{pro.pid}}"

//获取

var pid1=event.currentTarget.dataset.ppid;

wx.navigateTo({

    url: '/pages/pro/pro?pid='+ pid1,

});

5.获取输入框的值

<form bindsubmit="formSubmit">

        <input focus="{{true}}" name="inp"></input>

        <button formType="submit" >发送</button>

</form>

formSubmit: function (e) {

   var inp=e.detail.value.inp

}

6.获取数组长度

wxml中直接

{{array.length}}

js中

array.length

7.强制转换

let i = parseInt(count);

console.log(i)

8.字符串转数组

var list=JSON.parse(res.data)

9.数组里插入一个属性

for (var i = 0; i < list.length; i++) {

list[i].sex = '男';

}