本文实例为大家分享了javascript实现移动端上传图片的具体代码，供大家参考，具体内容如下

核心部分(.html)

window.onload = function() { let fileTag = document.getElementById('file'); // console.log(fileTag) // console.log(this.pic) let that = this fileTag.onchange = function() { let file = fileTag.files[0]; let fileReader = new FileReader(); // console.log(file) console.log(fileReader) // console.log(that.pic) fileReader.onloadend = function() { console.log(1212) if (fileReader.readyState == fileReader.DONE) { // console.log(that.pic) console.log(fileReader) if(that.pic=="") { console.log(1111) that.pic = fileReader.result that.input1 = false that.upLoad(fileReader.result) return }else{ if(that.pic2=='') { console.log(2222) that.pic2 = fileReader.result that.input2 = false return }else { if(that.pic3=='') { console.log(3333) that.pic3 = fileReader.result that.input3 = false return }else { if(that.pic4=='') { console.log(4444) that.pic4 = fileReader.result that.input4 = false return }else { console.log(5555) if(that.pic5=='') { that.pic5 = fileReader.result that.input5 = false return } } } } } // console.log(that.pic) } }; fileReader.readAsDataURL(file); }}

vue项目代码

主要是HTML页面设计

<div class="imgBox" @click="upImg"> <div style="display:flex;flex-flow:wrap;"> <div class="Img" > <label> <img v-if="pic==''" src="./img/addPhotos.jpg"> <img v-else width='100%' height='100%' style="border-radius:5px" id="img" :src="pic"> <input v-if="input1" class="myInput" type="file" id="file" accept="image/*" multiple required> </label> <div v-if="pic!=''" class="myDel" @click="delImg(1)">X</div> </div> <div class="Img" v-if="pic!='' || !input2"> <label> <img v-if="pic2==''" src="./img/addPhotos.jpg"> <img v-else width='100%' height='100%' style="border-radius:5px" :src="pic2"> <input v-if="input2" class="myInput" type="file" id="file" accept="image/*" multiple required> </label> <div v-if="pic2!=''" class="myDel" @click="delImg(2)">X</div> </div> <div class="Img" v-if="(pic!='' && pic2!='' ) || !input3"> <label> <img v-if="pic3==''" src="./img/addPhotos.jpg"> <img v-else width='100%' height='100%' style="border-radius:5px" :src="pic3"> <input v-if="input3" class="myInput" type="file" id="file" accept="image/*" multiple required> </label> <div v-if="pic3!=''" class="myDel" @click="delImg(3)">X</div> </div> <div class="Img" v-if="(pic!='' && pic2!='' && pic3!='') || !input4"> <label> <img v-if="pic4==''" src="./img/addPhotos.jpg"> <img v-else width='100%' height='100%' style="border-radius:5px" :src="pic4"> <input v-if="input4" class="myInput" type="file" id="file" accept="image/*" multiple required> </label> <div v-if="pic4!=''" class="myDel" @click="delImg(4)">X</div> </div> <div class="Img" v-if="(pic!='' && pic2!='' && pic3!='' && pic4!='') || !input5"> <label> <img v-if="pic5==''" src="./img/addPhotos.jpg"> <img v-else width='100%' height='100%' style="border-radius:5px" :src="pic5"> <input v-if="input5" class="myInput" type="file" id="file" accept="image/*" multiple required> </label> <div v-if="pic5!=''" class="myDel" @click="delImg(5)">X</div> </div> </div></div>

data（）部分

pic:'',pic2:'',pic3:'',pic4:'',pic5:'',input1:true,input2:true,input3:true,input4:true,input5:true

methods:{}部分

upImg() { // window.onload = function() { let fileTag = document.getElementById('file'); // console.log(fileTag) // console.log(this.pic) let that = this fileTag.onchange = function() { let file = fileTag.files[0]; let fileReader = new FileReader(); // console.log(file) console.log(fileReader) // console.log(that.pic) fileReader.onloadend = function() { console.log(1212) if (fileReader.readyState == fileReader.DONE) { // console.log(that.pic) console.log(fileReader) if(that.pic=="") { console.log(1111) that.pic = fileReader.result that.input1 = false that.upLoad(fileReader.result) return }else{ if(that.pic2=='') { console.log(2222) that.pic2 = fileReader.result that.input2 = false return }else { if(that.pic3=='') { console.log(3333) that.pic3 = fileReader.result that.input3 = false return }else { if(that.pic4=='') { console.log(4444) that.pic4 = fileReader.result that.input4 = false return }else { console.log(5555) if(that.pic5=='') { that.pic5 = fileReader.result that.input5 = false return } } } } } // console.log(that.pic) } }; fileReader.readAsDataURL(file); } // } },delImg(num) { if(num==1) { this.pic = '' this.input1 = true } if(num==2) { this.pic2 = '' this.input2 = true } if(num==3) { this.pic3 = '' this.input3 = true } if(num==4) { this.pic4 = '' this.input4 = true } if(num==5) { this.pic5 = '' this.input5 = true }}

css部分（style）

#order .imgBox { margin-bottom: 100px; padding: 20px; box-sizing: border-box; background: #fff; height: 250px;}#order .Img { width: 90px; height: 90px; background: #fff; text-align: center; line-height: 132px; box-sizing: border-box; border-radius: 5px; border: 1px solid rgba(0,0,0,.2); position: relative; margin: 0 20px 20px 0;}#order .myInput { opacity:0; position:absolute; top:0; top:0; width:90px; height:90px; left:0;}#order .myDel { color: #fff; position: absolute; right: -10px; top: -7px; width: 25px; height: 25px; border-radius: 25px; line-height: 25px; background: rgba(0,0,0,.5);}

效果图

更多精彩内容请参考专题《ajax上传技术汇总》，《javascript文件上传操作汇总》和《jQuery上传操作汇总》进行学习。

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。