eval语句

Question

我在Firefox 47.0.1中使用Firefox检查器在控制台中尝试此代码。我在最后一个eval语句中收到错误：

eval( 'jspaginate["init"] =' + newCode);

我发誓最后一个评估工作在2016年8月左右！我收到此错误

  

SyntaxError：missing;在陈述之前

这是我的代码。我发现前两个eval语句有效。

var debug  = 1;

newCode = `init: function(target, current){
        console.log ("   update:");
        this.data.pageIndex = current;
        this.pushState(target, current);
        this.getData(target);
    }`;
console.log ("newCode typeof is " + typeof newCode + " -->" + newCode+"<--");

var passString =  new String('jspaginate["init"] =' + newCode);
console.log ("passString -->" + passString + "<--");
eval(passString);
if ( debug ) console.log("--> update:\n"+window.jspaginate["init"].toString() );

eval( new String('jspaginate["init"] =' + newCode));
if ( debug ) console.log("--> update:\n"+window.jspaginate["init"].toString() );

console.log ("constant typeofis " + typeof ('jspaginate["init"] =' + newCode) );

/* This eval gets an error */
eval( 'jspaginate["init"] =' + newCode);
console.log ("second eval completed." );
if ( debug ) console.log("--> update:\n"+window.jspaginate["init"].toString() );

这是我在控制台中看到的内容。我将代码粘贴到控制台中，然后按Enter键。我在这个页面上 https://discussions.apple.com/thread/7824331

var debug  = 1;

newCode = `init: function(target, current){
        console.log ("   update:");
        this.data.pageIndex = current;
        this.pushState(target, current);
        this.getData(target);
    }`;
console.log ("newCode typeof is " + typeof newCode + " -->" + newCode+"<--");

var passString =  new String('jspaginate["init"] =' + newCode);
console.log ("passString -->" + passString + "<--");
eval(passString);
if ( debug ) console.log("--> update:\n"+window.jspaginate["init"].toString() );

eval( new String('jspaginate["init"] =' + newCode));
if ( debug ) console.log("--> update:\n"+window.jspaginate["init"].toString() );

console.log ("constant typeofis " + typeof ('jspaginate["init"] =' + newCode) );

/* This eval gets an error */
eval( 'jspaginate["init"] =' + newCode);
console.log ("second eval completed." );
if ( debug ) console.log("--> update:\n"+window.jspaginate["init"].toString() );

newCode typeof is string -->init: function(target, current){
        console.log ("   update:");
        this.data.pageIndex = current;
        this.pushState(target, current);
        this.getData(target);
    }<--
passString -->jspaginate["init"] =init: function(target, current){
        console.log ("   update:");
        this.data.pageIndex = current;
        this.pushState(target, current);
        this.getData(target);
    }<--
--> update:
function (action, last){
        var view = this,
            target, current;
        if(this.loading !== true){
            view.loadingSequence();
            window.paginationActive = true;
            if(action === 'first'){
                target = 0;
                view.update(target, 0);
            }else if(action === 'prev'){
                current = parseInt(view.data.pageIndex)-1;
                target = (current)*view.data.range;
                view.update(target, current);
            }else if(action === 'next'){
                current = parseInt(view.data.pageIndex)+1;
                target = (current)*view.data.range;
                view.update(target, current);
            }else if(action === 'last'){
                current = parseInt(last)-1;
                target = (current)*view.data.range;
                view.update(target, current);
            }
        }
    }
--> update:
function (action, last){
        var view = this,
            target, current;
        if(this.loading !== true){
            view.loadingSequence();
            window.paginationActive = true;
            if(action === 'first'){
                target = 0;
                view.update(target, 0);
            }else if(action === 'prev'){
                current = parseInt(view.data.pageIndex)-1;
                target = (current)*view.data.range;
                view.update(target, current);
            }else if(action === 'next'){
                current = parseInt(view.data.pageIndex)+1;
                target = (current)*view.data.range;
                view.update(target, current);
            }else if(action === 'last'){
                current = parseInt(last)-1;
                target = (current)*view.data.range;
                view.update(target, current);
            }
        }
    }
constant typeofis string
SyntaxError: missing ; before statement