解决层级按序排号、接口返回参数双向绑定值无法修改问题、表单重置、路由截取参数、目标打印

1、item.optionValues.sort((a, b) => a['optionSort'] - b['optionSort'])   //a-b从小到大   b-a从大到小

2、接口返回参数双向绑定值无法修改问题用this.$set()  //this.$set(需要被改值的对象，被改的键，被改的值)

3、Object.assign(this.$data.mesPiform, this.$options.data.call(this).mesPiform)  //重置表单某个独立的项

4、获取网页路由的参数 (需要配合判断使用确认路由中是否包含该参数信息)：

let url = new URL(location.href) 

let preMes = url.searchParams.get('name')   5、目标打印：（1）创建print.js文件   （2）直接传结构就欧克

const Print = function (dom, options) {
    if (!(this instanceof Print)) return new Print(dom, options);

    this.options = this.extend({
        'noPrint': '.no-print'
    }, options);

    if ((typeof dom) === "string") {
        this.dom = document.querySelector(dom);
    } else {
        this.isDOM(dom)
        this.dom = this.isDOM(dom) ? dom : dom.$el;
    }

    this.init();
};
Print.prototype = {
    init: function () {
        var content = this.getStyle() + this.getHtml();
        this.writeIframe(content);
    },
    extend: function (obj, obj2) {
        for (var k in obj2) {
            obj[k] = obj2[k];
        }
        return obj;
    },

    getStyle: function () {
        var str = "",
            styles = document.querySelectorAll('style,link');
        for (var i = 0; i < styles.length; i++) {
            str += styles[i].outerHTML;
        }
        str += "<style>" + (this.options.noPrint ? this.options.noPrint : '.no-print') + "{display:none;}</style>";

        return str;
    },

    getHtml: function () {
        var inputs = document.querySelectorAll('input');
        var textareas = document.querySelectorAll('textarea');
        var selects = document.querySelectorAll('select');

        for (var k = 0; k < inputs.length; k++) {
            if (inputs[k].type == "checkbox" || inputs[k].type == "radio") {
                if (inputs[k].checked == true) {
                    inputs[k].setAttribute('checked', "checked")
                } else {
                    inputs[k].removeAttribute('checked')
                }
            } else if (inputs[k].type == "text") {
                inputs[k].setAttribute('value', inputs[k].value)
            } else {
                inputs[k].setAttribute('value', inputs[k].value)
            }
        }

        for (var k2 = 0; k2 < textareas.length; k2++) {
            if (textareas[k2].type == 'textarea') {
                textareas[k2].innerHTML = textareas[k2].value
            }
        }

        for (var k3 = 0; k3 < selects.length; k3++) {
            if (selects[k3].type == 'select-one') {
                var child = selects[k3].children;
                for (var i in child) {
                    if (child[i].tagName == 'OPTION') {
                        if (child[i].selected == true) {
                            child[i].setAttribute('selected', "selected")
                        } else {
                            child[i].removeAttribute('selected')
                        }
                    }
                }
            }
        }

        return this.dom.outerHTML;
    },

    writeIframe: function (content) {
        var w, doc, iframe = document.createElement('iframe'),
            f = document.body.appendChild(iframe);
        iframe.id = "myIframe";
        //iframe.style = "position:absolute;width:0;height:0;top:-10px;left:-10px;";
        iframe.setAttribute('style', 'position:absolute;width:0;height:0;top:-10px;left:-10px;');
        w = f.contentWindow || f.contentDocument;
        doc = f.contentDocument || f.contentWindow.document;
        doc.open();
        doc.write(content);
        doc.close();
        var _this = this
        iframe.onload = function () {
            _this.toPrint(w);
            setTimeout(function () {
                document.body.removeChild(iframe)
            }, 100)
        }
    },

    toPrint: function (frameWindow) {
        try {
            setTimeout(function () {
                frameWindow.focus();
                try {
                    if (!frameWindow.document.execCommand('print', false, null)) {
                        frameWindow.print();
                    }
                } catch (e) {
                    frameWindow.print();
                }
                frameWindow.close();
            }, 10);
        } catch (err) {
            console.log('err', err);
        }
    },
    isDOM: (typeof HTMLElement === 'object') ?
        function (obj) {
            return obj instanceof HTMLElement;
        } :
        function (obj) {
            return obj && typeof obj === 'object' && obj.nodeType === 1 && typeof obj.nodeName === 'string';
        }
};
const MyPlugin = {}
MyPlugin.install = function (Vue, options) {
    // 4. 添加实例方法
    Vue.prototype.$print = Print
}
export default MyPlugin

//加入class="no-print"为不用打印部分
<template>
  <div>
    <h1 ref="print">
      <div>打印区域</div>
      <div class="no-print">打印区域</div>
    </h1>
    <button @click="printFn">打印</button>
  </div>
</template>

<script>
export default {
    methods: {
    printFn() {
      //传入dom结构即可
      this.$print(this.$refs.print);
    },
    },
}
</script>
<style></style>

 

标签：function,inputs,obj,dom,表单,print,参数,按序,var
来源： https://www.cnblogs.com/zj6666/p/16635724.html